diff --git a/src/mibew/client.php b/src/mibew/client.php
index 26f3f222..f0ebc8f1 100644
--- a/src/mibew/client.php
+++ b/src/mibew/client.php
@@ -24,6 +24,9 @@ require_once(dirname(__FILE__).'/libs/captcha.php');
 require_once(dirname(__FILE__).'/libs/invitation.php');
 require_once(dirname(__FILE__).'/libs/track.php');
 require_once(dirname(__FILE__).'/libs/classes/thread.php');
+require_once(dirname(__FILE__).'/libs/interfaces/style.php');
+require_once(dirname(__FILE__).'/libs/classes/style.php');
+require_once(dirname(__FILE__).'/libs/classes/chat_style.php');
 
 if(Settings::get('enablessl') == "1" && Settings::get('forcessl') == "1") {
 	if(!is_secure_request()) {
@@ -37,6 +40,8 @@ if(Settings::get('enablessl') == "1" && Settings::get('forcessl') == "1") {
 	}
 }
 
+// Initialize chat style which is currently used in system
+$chat_style = new ChatStyle(ChatStyle::currentStyle());
 
 // Do not support old browsers at all
 if (get_remote_level($_SERVER['HTTP_USER_AGENT']) == 'old') {
@@ -44,7 +49,7 @@ if (get_remote_level($_SERVER['HTTP_USER_AGENT']) == 'old') {
 	$page = array_merge_recursive(
 		setup_logo()
 	);
-	expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "nochat.tpl");
+	$chat_style->render('nochat');
 	exit;
 }
 
@@ -63,7 +68,7 @@ if (verifyparam("act", "/^(invitation)$/", "default") == 'invitation'
 		// Build js application options
 		$page['invitationOptions'] = json_encode($page['invitation']);
 		// Expand page
-		expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "chat.tpl");
+		$chat_style->render('chat');
 		exit;
 	}
 }
@@ -129,7 +134,7 @@ if( !isset($_GET['token']) || !isset($_GET['thread']) ) {
 				)
 			);
 			$page['leaveMessageOptions'] = json_encode($page['leaveMessage']);
-			expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "chat.tpl");
+			$chat_style->render('chat');
 			exit;
 		}
 
@@ -158,7 +163,7 @@ if( !isset($_GET['token']) || !isset($_GET['thread']) ) {
 				setup_survey($visitor['name'], $email, $groupid, $info, $referrer)
 			);
 			$page['surveyOptions'] = json_encode($page['survey']);
-			expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "chat.tpl");
+			$chat_style->render('chat');
 			exit;
 		}
 
@@ -184,12 +189,12 @@ $page = setup_chatview_for_user($thread);
 
 $pparam = verifyparam( "act", "/^(mailthread)$/", "default");
 if( $pparam == "mailthread" ) {
-	expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "mail.tpl");
+	$chat_style->render('mail');
 } else {
 	// Build js application options
 	$page['chatOptions'] = json_encode($page['chat']);
 	// Expand page
-	expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "chat.tpl");
+	$chat_style->render('chat');
 }
 
 ?>
\ No newline at end of file
diff --git a/src/mibew/libs/chat.php b/src/mibew/libs/chat.php
index ad9e7981..2c17b741 100644
--- a/src/mibew/libs/chat.php
+++ b/src/mibew/libs/chat.php
@@ -24,6 +24,9 @@ require_once(dirname(__FILE__).'/classes/mibew_api_execution_context.php');
 require_once(dirname(__FILE__).'/classes/request_processor.php');
 require_once(dirname(__FILE__).'/classes/client_side_processor.php');
 require_once(dirname(__FILE__).'/classes/thread_processor.php');
+require_once(dirname(__FILE__).'/interfaces/style.php');
+require_once(dirname(__FILE__).'/classes/style.php');
+require_once(dirname(__FILE__).'/classes/chat_style.php');
 
 
 /**
@@ -418,7 +421,8 @@ function setup_chatview(Thread $thread) {
 	$data['neediframesrc'] = needsFramesrc();
 
 	// Load dialogs style options
-	$style_config = get_dialogs_style_config(getchatstyle());
+	$chat_style = new ChatStyle(ChatStyle::currentStyle());
+	$style_config = $chat_style->configurations();
 	$data['chat']['windowsParams']['mail']
 		= $style_config['mail']['window_params'];
 
diff --git a/src/mibew/libs/classes/chat_style.php b/src/mibew/libs/classes/chat_style.php
new file mode 100644
index 00000000..e6ea06dd
--- /dev/null
+++ b/src/mibew/libs/classes/chat_style.php
@@ -0,0 +1,129 @@
+<?php
+/*
+ * Copyright 2005-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Represents a chat style
+ */
+class ChatStyle extends Style implements StyleInterface {
+	/**
+	 * Builds base path for style files. This path is relative Mibew root and
+	 * does not contain neither leading nor trailing slash.
+	 *
+	 * @return string Base path for style files
+	 */
+	public function filesPath() {
+		return 'styles/dialogs/' . $this->name();
+	}
+
+	/**
+	 * Renders template file to HTML and send it to the output
+	 *
+	 * @param string $template_name Name of the template file without path and
+	 * extension
+	 */
+	public function render($template_name) {
+		$templates_root = dirname(dirname(dirname(__FILE__))) .
+			'/' . $this->filesPath() . '/templates/';
+		$full_template_name = $template_name . '.tpl';
+
+		expand($this, $templates_root, $full_template_name);
+	}
+
+	/**
+	 * Returns name of the style which is currently used in the system
+	 *
+	 * @return string Name of a style
+	 */
+	public static function currentStyle() {
+		// Ceck if request contains chat style
+		$style_name = verifyparam("style", "/^\w+$/", "");
+		if (!$style_name) {
+			// Load value from system settings
+			$style_name = Settings::get('chat_style');
+		}
+
+		// Get all style list and make sure that in has at least one style.
+		$available_styles = self::availableStyles();
+		if (empty($available_styles)) {
+			throw new RuntimeException('There are no dialog styles in the system');
+		}
+
+		// Check if selected style exists. If it does not exist try to fall back
+		// to "default". Finally, if there is no appropriate style in the system
+		// throw an exception.
+		if (in_array($style_name, $available_styles)) {
+			return $style_name;
+		} elseif (in_array('default', $available_styles)) {
+			return 'default';
+		} else {
+			throw new RuntimeException('There is no appropriate dialog style in the system');
+		}
+	}
+
+	/**
+	 * Sets style which is currently used in the system
+	 *
+	 * @param string $style_name Name of a style
+	 */
+	public static function setCurrentStyle($style_name) {
+		Settings::set('chat_style', $style_name);
+		Settings::update();
+	}
+
+	/**
+	 * Returns an array which contains names of available styles.
+	 *
+	 * @param array List of styles names
+	 */
+	public static function availableStyles() {
+		$styles_root = dirname(dirname(dirname(__FILE__))) .
+			'/styles/dialogs';
+
+		return self::getStyleList($styles_root);
+	}
+
+	/**
+	 * Returns array of default configurations for concrete style object. This
+	 * method uses "Template method" design pattern.
+	 *
+	 * @return array Default configurations of the style
+	 */
+	protected function defaultConfigurations() {
+		return array(
+			'history' => array(
+				'window_params' => ''
+			),
+			'users' => array(
+				'thread_tag' => 'div',
+				'visitor_tag' => 'div'
+			),
+			'tracked' => array(
+				'user_window_params' => '',
+				'visitor_window_params' => ''
+			),
+			'invitation' => array(
+				'window_params' => ''
+			),
+			'ban' => array(
+				'window_params' => ''
+			),
+			'screenshots' => array()
+		);
+	}
+}
+
+?>
\ No newline at end of file
diff --git a/src/mibew/libs/classes/settings.php b/src/mibew/libs/classes/settings.php
index c4a759db..4f34f1ff 100644
--- a/src/mibew/libs/classes/settings.php
+++ b/src/mibew/libs/classes/settings.php
@@ -65,7 +65,7 @@ Class Settings {
 			'hosturl' => 'http://mibew.org',
 			'logo' => '',
 			'usernamepattern' => '{name}',
-			'chatstyle' => 'default',
+			'chat_style' => 'default',
 			'invitationstyle' => 'default',
 			'operator_pages_style' => 'default',
 			'chattitle' => 'Live Support',
diff --git a/src/mibew/libs/classes/style.php b/src/mibew/libs/classes/style.php
new file mode 100644
index 00000000..3fd5c254
--- /dev/null
+++ b/src/mibew/libs/classes/style.php
@@ -0,0 +1,135 @@
+<?php
+/*
+ * Copyright 2005-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Base class for styles
+ */
+abstract class Style {
+	/**
+	 * Styles configuration array or NULL by default
+	 * @var array|NULL
+	 */
+	protected $cachedConfigurations = NULL;
+
+	/**
+	 * This value is used to store name of a style
+	 * @var string
+	 */
+	protected $styleName;
+
+	/**
+	 * Contains cached results of the Style::getStyleList method. The lists are
+	 * keyed by the $root_dir argument of the method.
+	 * @var array
+	 * @see Style::getStyleList
+	 */
+	protected static $cachedStyleLists = array();
+
+	/**
+	 * Object constructor
+	 *
+	 * @param string $style_name Name of the style
+	 */
+	public function __construct($style_name) {
+		$this->styleName = $style_name;
+	}
+
+	/**
+	 * Returns name of the style related with the object
+	 *
+	 * @return string Name of the style
+	 */
+	public function name() {
+		return $this->styleName;
+	}
+
+	/**
+	 * Loads configurations of the style. The results is cached in the class
+	 * instance.
+	 *
+	 * @return array Style configurations
+	 * @throws RuntimeException
+	 */
+	public function configurations() {
+		$config_file = dirname(dirname(dirname(__FILE__)))
+			. '/' . $this->filesPath() . '/config.ini';
+
+		// Check if configurations already loaded. Do not do the job twice.
+		if (is_null($this->cachedConfigurations)) {
+			// Set empty value for configuration array
+			$this->cachedConfigurations = array();
+
+			// Try to read configuration file
+			if (!is_readable($config_file)) {
+				throw new RuntimeException('Cannot read configuration file');
+			}
+
+			// Load configurations from file, merge it with default configs and
+			// cache the result.
+			$loaded_config = parse_ini_file($config_file, true);
+			$default_config = $this->defaultConfigurations();
+			$this->cachedConfigurations = $loaded_config + $default_config;
+		}
+
+		return $this->cachedConfigurations;
+	}
+
+	/**
+	 * Gets names of styles which are located in the $root_dir.
+	 *
+	 * @param string $root_dir Root styles directory
+	 * @return array List of styles' names
+	 */
+	protected static function getStyleList($root_dir) {
+		// Check if styles list is already stored in the cache
+		if (!isset(self::$cachedStyleLists[$root_dir])) {
+			// Build list of styles for the specified root directory.
+			$style_list = array();
+			if ($handle = opendir($root_dir)) {
+				while (false !== ($file = readdir($handle))) {
+					if (preg_match("/^\w+$/", $file) && is_dir("$root_dir/$file")) {
+						$style_list[$file] = $file;
+					}
+				}
+				closedir($handle);
+			}
+
+			// Cache the list
+			self::$cachedStyleLists[$root_dir] = $style_list;
+		}
+
+		return self::$cachedStyleLists[$root_dir];
+	}
+
+	/**
+	 * Builds base path for style files. This path is relative Mibew root and
+	 * does not contain neither leading nor trailing slash.
+	 *
+	 * @return string Base path for style files
+	 */
+	public abstract function filesPath();
+
+	/**
+	 * Returns array of default configurations for concrete style object. This
+	 * method uses "Template method" design pattern.
+	 *
+	 * @return array Default configurations of the style
+	 */
+	protected abstract function defaultConfigurations();
+}
+
+?>
\ No newline at end of file
diff --git a/src/mibew/libs/common/configurations.php b/src/mibew/libs/common/configurations.php
index 829b95ea..36c7268d 100644
--- a/src/mibew/libs/common/configurations.php
+++ b/src/mibew/libs/common/configurations.php
@@ -67,32 +67,4 @@ function get_core_style_config($style) {
 	return $config;
 }
 
-/**
- * Load configuration array for dialogs style
- *
- * @param string $style Style name
- * @return array Configuration array
- */
-function get_dialogs_style_config($style) {
-	// Get root dir of mibew messanger
-	$base_path = realpath(dirname(dirname(dirname(__FILE__))));
-
-	// Load config
-	$config = read_config_file($base_path.'/styles/dialogs/'.$style.'/config.ini');
-
-	// Set default values
-	$config = ($config === false) ? array() : $config;
-	$config += array(
-		'chat' => array(
-			'window_params' => ''
-		),
-		'mail' => array(
-			'window_params' => ''
-		),
-		'screenshots' => array()
-	);
-
-	return $config;
-}
-
 ?>
\ No newline at end of file
diff --git a/src/mibew/libs/common/request.php b/src/mibew/libs/common/request.php
index 8012850f..a2075ff2 100644
--- a/src/mibew/libs/common/request.php
+++ b/src/mibew/libs/common/request.php
@@ -76,15 +76,6 @@ function is_secure_request()
 			|| isset($_SERVER["HTTP_HTTPS"]) && $_SERVER["HTTP_HTTPS"] == "on";
 }
 
-function getchatstyle()
-{
-	$chatstyle = verifyparam("style", "/^\w+$/", "");
-	if ($chatstyle) {
-		return $chatstyle;
-	}
-	return Settings::get('chatstyle');
-}
-
 /**
  * Returns name of the current operator pages style
  *
diff --git a/src/mibew/libs/expand.php b/src/mibew/libs/expand.php
index 6332811b..2363717d 100644
--- a/src/mibew/libs/expand.php
+++ b/src/mibew/libs/expand.php
@@ -17,7 +17,7 @@
 
 $ifregexp = "/\\\${(if|ifnot):([\w\.]+)}(.*?)(\\\${else:\\2}.*?)?\\\${endif:\\2}/s";
 $expand_include_path = "";
-$current_style = "";
+$current_style = NULL;
 $flatten_page = array();
 
 
@@ -52,9 +52,9 @@ function expand_var($matches)
 		if ($var == 'mibewroot') {
 			return $mibewroot;
 		} else if ($var == 'tplroot') {
-			return "$mibewroot/styles/dialogs/$current_style";
+			return "$mibewroot/" . $current_style->filesPath();
 		} else if ($var == 'styleid') {
-			return $current_style;
+			return $current_style->name();
 		} else if ($var == 'pagination') {
 			return generate_pagination($page['pagination']);
 		} else if ($var == 'errors' || $var == 'harderrors') {
@@ -110,24 +110,16 @@ function expandtext($text)
 	return preg_replace_callback("/\\\${(\w+:)?([\w\.,]+)}/", "expand_var", $text);
 }
 
-function expand($basedir, $style, $filename)
+function expand(StyleInterface $style, $templates_root, $filename)
 {
 	global $page, $expand_include_path, $current_style, $flatten_page;
 
 	$flatten_page = array_flatten_recursive($page);
 
 	start_html_output();
-	if (!is_dir("$basedir/$style")) {
-		$style = "default";
-	}
-	$expand_include_path = "$basedir/$style/templates/";
+	$expand_include_path = $templates_root;
 	$current_style = $style;
 	$contents = @file_get_contents($expand_include_path . $filename);
-	if ($contents === false) {
-		$expand_include_path = "$basedir/default/templates/";
-		$current_style = "default";
-		$contents = @file_get_contents($expand_include_path . $filename) or die("cannot load template");
-	}
 	echo expandtext($contents);
 }
 
diff --git a/src/mibew/libs/interfaces/style.php b/src/mibew/libs/interfaces/style.php
new file mode 100644
index 00000000..cd0a5074
--- /dev/null
+++ b/src/mibew/libs/interfaces/style.php
@@ -0,0 +1,74 @@
+<?php
+/*
+ * Copyright 2005-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Determine interface for specific style class.
+ */
+interface StyleInterface {
+	/**
+	 * Returns name of the style which is currently used in the system
+	 *
+	 * @return string Name of a style
+	 */
+	public static function currentStyle();
+
+	/**
+	 * Sets style which is currently used in the system
+	 *
+	 * @param string $style_name Name of a style
+	 */
+	public static function setCurrentStyle($style_name);
+
+	/**
+	 * Returns an array which contains names of available styles.
+	 *
+	 * @param array List of styles names
+	 */
+	public static function availableStyles();
+
+	/**
+	 * Builds base path for style files. This URL is relative Mibew root and
+	 * does not contain neither leading nor trailing slash.
+	 *
+	 * @return string Base path for style files
+	 */
+	public function filesPath();
+
+	/**
+	 * Loads and returns configurations of the style.
+	 *
+	 * @param array $name Style's configuration params
+	 */
+	public function configurations();
+
+	/**
+	 * Returns name of the style related with the object
+	 *
+	 * @return string Name of the style
+	 */
+	public function name();
+
+	/**
+	 * Renders template file to HTML and send it to the output
+	 *
+	 * @param string $template_name Name of the template file without path and
+	 * extension.
+	 */
+	public function render($template_name);
+}
+
+?>
\ No newline at end of file
diff --git a/src/mibew/mail.php b/src/mibew/mail.php
index 79203992..5b8b68cd 100644
--- a/src/mibew/mail.php
+++ b/src/mibew/mail.php
@@ -21,6 +21,9 @@ require_once(dirname(__FILE__).'/libs/expand.php');
 require_once(dirname(__FILE__).'/libs/groups.php');
 require_once(dirname(__FILE__).'/libs/notify.php');
 require_once(dirname(__FILE__).'/libs/classes/thread.php');
+require_once(dirname(__FILE__).'/libs/interfaces/style.php');
+require_once(dirname(__FILE__).'/libs/classes/style.php');
+require_once(dirname(__FILE__).'/libs/classes/chat_style.php');
 
 $errors = array();
 $page = array();
@@ -33,6 +36,9 @@ if (! $thread) {
 	die("wrong thread");
 }
 
+// Initialize chat style which is currently used in system
+$chat_style = new ChatStyle(ChatStyle::currentStyle());
+
 $email = getparam('email');
 $page['email'] = $email;
 $group = is_null($thread->groupId)?NULL:group_by_id($thread->groupId);
@@ -51,7 +57,7 @@ if( count($errors) > 0 ) {
 		$page,
 		setup_logo($group)
 	);
-	expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "mail.tpl");
+	$chat_style->render('mail');
 	exit;
 }
 
@@ -74,6 +80,6 @@ $page = array_merge_recursive(
 	$page,
 	setup_logo($group)
 );
-expand(dirname(__FILE__).'/styles/dialogs', getchatstyle(), "mailsent.tpl");
+$chat_style->render('mailsent');
 exit;
 ?>
\ No newline at end of file
diff --git a/src/mibew/operator/agent.php b/src/mibew/operator/agent.php
index 2c4b1d9c..36ac34eb 100644
--- a/src/mibew/operator/agent.php
+++ b/src/mibew/operator/agent.php
@@ -24,6 +24,9 @@ require_once(dirname(dirname(__FILE__)).'/libs/pagination.php');
 require_once(dirname(dirname(__FILE__)).'/libs/expand.php');
 require_once(dirname(dirname(__FILE__)).'/libs/classes/thread.php');
 require_once(dirname(dirname(__FILE__)).'/libs/view.php');
+require_once(dirname(dirname(__FILE__)).'/libs/interfaces/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/chat_style.php');
 
 $operator = check_login();
 
@@ -42,21 +45,22 @@ if (Settings::get('enablessl') == "1" && Settings::get('forcessl') == "1") {
 $threadid = verifyparam("thread", "/^\d{1,8}$/");
 $page = array();
 
+// Initialize chat style which is currently used in system
+$chat_style = new ChatStyle(ChatStyle::currentStyle());
+
 if (!isset($_GET['token'])) {
 
 	$remote_level = get_remote_level($_SERVER['HTTP_USER_AGENT']);
 	if ($remote_level != "ajaxed") {
 		$errors = array(getlocal("thread.error.old_browser"));
-		start_html_output();
-		expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+		$chat_style->render('error');
 		exit;
 	}
 
 	$thread = Thread::load($threadid);
 	if (!$thread || !isset($thread->lastToken)) {
 		$errors = array(getlocal("thread.error.wrong_thread"));
-		start_html_output();
-		expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+		$chat_style->render('error');
 		exit;
 	}
 
@@ -67,8 +71,7 @@ if (!isset($_GET['token'])) {
 
 		if (!is_capable(CAN_TAKEOVER, $operator)) {
 			$errors = array(getlocal("thread.error.cannot_take_over"));
-			start_html_output();
-			expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+			$chat_style->render('error');
 			exit;
 		}
 
@@ -86,14 +89,12 @@ if (!isset($_GET['token'])) {
 	if (!$viewonly) {
 		if(! $thread->take($operator)){
 			$errors = array(getlocal("thread.error.cannot_take"));
-			start_html_output();
-			expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+			$chat_style->render('error');
 			exit;
 		}
 	} else if (!is_capable(CAN_VIEWTHREADS, $operator)) {
 		$errors = array(getlocal("thread.error.cannot_view"));
-		start_html_output();
-		expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+		$chat_style->render('error');
 		exit;
 	}
 
@@ -111,8 +112,7 @@ if (!$thread) {
 
 if ($thread->agentId != $operator['operatorid'] && !is_capable(CAN_VIEWTHREADS, $operator)) {
 	$errors = array("Cannot view threads");
-	start_html_output();
-	expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+	$chat_style->render('error');
 	exit;
 }
 
@@ -126,12 +126,12 @@ start_html_output();
 $pparam = verifyparam("act", "/^(redirect)$/", "default");
 if ($pparam == "redirect") {
 	setup_redirect_links($threadid, $operator, $token);
-	expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "redirect.tpl");
+	$chat_style->render('redirect');
 } else {
 	// Build js application options
 	$page['chatOptions'] = json_encode($page['chat']);
 	// Expand page
-	expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "chat.tpl");
+	$chat_style->render('chat');
 }
 
 ?>
\ No newline at end of file
diff --git a/src/mibew/operator/getcode.php b/src/mibew/operator/getcode.php
index 3a99d81c..8235d405 100644
--- a/src/mibew/operator/getcode.php
+++ b/src/mibew/operator/getcode.php
@@ -21,6 +21,9 @@ require_once(dirname(dirname(__FILE__)).'/libs/groups.php');
 require_once(dirname(dirname(__FILE__)).'/libs/getcode.php');
 require_once(dirname(dirname(__FILE__)).'/libs/styles.php');
 require_once(dirname(dirname(__FILE__)).'/libs/view.php');
+require_once(dirname(dirname(__FILE__)).'/libs/interfaces/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/chat_style.php');
 
 $operator = check_login();
 force_password($operator);
@@ -34,7 +37,7 @@ if (!isset($imageLocales[$image])) {
 }
 $image_locales = $imageLocales[$image];
 
-$stylelist = get_style_list(dirname(dirname(__FILE__)).'/styles/dialogs');
+$stylelist = ChatStyle::availableStyles();
 $stylelist[""] = getlocal("page.preview.style_default");
 $style = verifyparam("style", "/^\w*$/", "");
 if ($style && !in_array($style, $stylelist)) {
diff --git a/src/mibew/operator/redirect.php b/src/mibew/operator/redirect.php
index fe6c43e5..181a984f 100644
--- a/src/mibew/operator/redirect.php
+++ b/src/mibew/operator/redirect.php
@@ -21,6 +21,9 @@ require_once(dirname(dirname(__FILE__)).'/libs/chat.php');
 require_once(dirname(dirname(__FILE__)).'/libs/expand.php');
 require_once(dirname(dirname(__FILE__)).'/libs/groups.php');
 require_once(dirname(dirname(__FILE__)).'/libs/classes/thread.php');
+require_once(dirname(dirname(__FILE__)).'/libs/interfaces/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/chat_style.php');
 
 $operator = check_login();
 
@@ -35,6 +38,9 @@ if (! $thread) {
 $page = array();
 $errors = array();
 
+// Initialize chat style which is currently used in system
+$chat_style = new ChatStyle(ChatStyle::currentStyle());
+
 if (isset($_GET['nextGroup'])) {
 	$nextid = verifyparam("nextGroup", "/^\d{1,8}$/");
 	$nextGroup = group_by_id($nextid);
@@ -110,10 +116,11 @@ $page = array_merge_recursive(
 	$page,
 	setup_logo()
 );
+
 if (count($errors) > 0) {
-	expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "error.tpl");
+	$chat_style->render('error');
 } else {
-	expand(dirname(dirname(__FILE__)).'/styles/dialogs', getchatstyle(), "redirected.tpl");
+	$chat_style->render('redirected');
 }
 
 ?>
\ No newline at end of file
diff --git a/src/mibew/operator/settings.php b/src/mibew/operator/settings.php
index 84036c1e..ce0d31c6 100644
--- a/src/mibew/operator/settings.php
+++ b/src/mibew/operator/settings.php
@@ -21,6 +21,9 @@ require_once(dirname(dirname(__FILE__)).'/libs/settings.php');
 require_once(dirname(dirname(__FILE__)).'/libs/styles.php');
 require_once(dirname(dirname(__FILE__)).'/libs/cron.php');
 require_once(dirname(dirname(__FILE__)).'/libs/view.php');
+require_once(dirname(dirname(__FILE__)).'/libs/interfaces/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/chat_style.php');
 
 $operator = check_login();
 force_password($operator);
@@ -29,7 +32,7 @@ csrfchecktoken();
 $page = array('agentId' => '');
 $errors = array();
 
-$stylelist = get_style_list(dirname(dirname(__FILE__)).'/styles/dialogs');
+$stylelist = ChatStyle::availableStyles();
 $operator_pages_style_list = get_style_list(dirname(dirname(__FILE__)).'/styles/operator_pages');
 
 $options = array(
@@ -39,7 +42,7 @@ $options = array(
 	'hosturl',
 	'usernamepattern',
 	'operator_pages_style',
-	'chatstyle',
+	'chat_style',
 	'chattitle',
 	'geolink',
 	'geolinkparams',
@@ -69,9 +72,9 @@ if (isset($_POST['email']) && isset($_POST['title']) && isset($_POST['logo'])) {
 	$params['sendmessagekey'] = verifyparam('sendmessagekey', "/^c?enter$/");
 	$params['cron_key'] = getparam('cronkey');
 
-	$params['chatstyle'] = verifyparam("chatstyle", "/^\w+$/", $params['chatstyle']);
-	if (!in_array($params['chatstyle'], $stylelist)) {
-		$params['chatstyle'] = $stylelist[0];
+	$params['chat_style'] = verifyparam("chat_style", "/^\w+$/", $params['chat_style']);
+	if (!in_array($params['chat_style'], $stylelist)) {
+		$params['chat_style'] = $stylelist[0];
 	}
 
 	$params['operator_pages_style'] = verifyparam("operator_pages_style", "/^\w+$/", $params['operator_pages_style']);
@@ -121,7 +124,7 @@ $page['formgeolinkparams'] = topage($params['geolinkparams']);
 $page['formusernamepattern'] = topage($params['usernamepattern']);
 $page['formoperatorpagesstyle'] = $params['operator_pages_style'];
 $page['availableOperatorPagesStyles'] = $operator_pages_style_list;
-$page['formchatstyle'] = $params['chatstyle'];
+$page['formchatstyle'] = $params['chat_style'];
 $page['formchattitle'] = topage($params['chattitle']);
 $page['formsendmessagekey'] = $params['sendmessagekey'];
 $page['availableChatStyles'] = $stylelist;
diff --git a/src/mibew/operator/themes.php b/src/mibew/operator/themes.php
index 48048d6e..20211536 100644
--- a/src/mibew/operator/themes.php
+++ b/src/mibew/operator/themes.php
@@ -22,12 +22,14 @@ require_once(dirname(dirname(__FILE__)).'/libs/operator.php');
 require_once(dirname(dirname(__FILE__)).'/libs/groups.php');
 require_once(dirname(dirname(__FILE__)).'/libs/expand.php');
 require_once(dirname(dirname(__FILE__)).'/libs/settings.php');
-require_once(dirname(dirname(__FILE__)).'/libs/styles.php');
 require_once(dirname(dirname(__FILE__)).'/libs/view.php');
+require_once(dirname(dirname(__FILE__)).'/libs/interfaces/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/chat_style.php');
 
 $operator = check_login();
 
-$stylelist = get_style_list(dirname(dirname(__FILE__)).'/styles/dialogs');
+$stylelist = ChatStyle::availableStyles();
 
 $preview = verifyparam("preview", "/^\w+$/", "default");
 if (!in_array($preview, $stylelist)) {
@@ -35,13 +37,15 @@ if (!in_array($preview, $stylelist)) {
 	$preview = $stylelist[$style_names[0]];
 }
 
-$style_config = get_dialogs_style_config($preview);
+$chat_style = new ChatStyle($preview);
+
+$style_config = $chat_style->configurations();
 
 $screenshots = array();
 foreach($style_config['screenshots'] as $name => $desc) {
 	$screenshots[] = array(
 		'name' => $name,
-		'file' => $mibewroot . '/styles/dialogs/' . $preview
+		'file' => $mibewroot . '/' . $chat_style->filesPath()
 			. '/screenshots/' . $name . '.png',
 		'description' => $desc
 	);
diff --git a/src/mibew/operator/users.php b/src/mibew/operator/users.php
index 7413958f..af4023a6 100644
--- a/src/mibew/operator/users.php
+++ b/src/mibew/operator/users.php
@@ -19,6 +19,9 @@ require_once(dirname(dirname(__FILE__)).'/libs/init.php');
 require_once(dirname(dirname(__FILE__)).'/libs/operator.php');
 require_once(dirname(dirname(__FILE__)).'/libs/groups.php');
 require_once(dirname(dirname(__FILE__)).'/libs/view.php');
+require_once(dirname(dirname(__FILE__)).'/libs/interfaces/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/style.php');
+require_once(dirname(dirname(__FILE__)).'/libs/classes/chat_style.php');
 
 $operator = check_login();
 force_password($operator);
@@ -41,7 +44,8 @@ $page['geoLink'] = Settings::get('geolink');
 $page['geoWindowParams'] = Settings::get('geolinkparams');
 
 // Load dialogs style options
-$style_config = get_dialogs_style_config(getchatstyle());
+$chat_style = new ChatStyle(ChatStyle::currentStyle());
+$style_config = $chat_style->configurations();
 $page['chatStyles.chatWindowParams'] = $style_config['chat']['window_params'];
 
 // Load core style options
diff --git a/src/mibew/styles/operator_pages/default/views/settings.php b/src/mibew/styles/operator_pages/default/views/settings.php
index 6c5c1e93..a49a22cf 100644
--- a/src/mibew/styles/operator_pages/default/views/settings.php
+++ b/src/mibew/styles/operator_pages/default/views/settings.php
@@ -125,18 +125,18 @@ require_once(dirname(__FILE__).'/inc_errors.php');
 		<div class="field">
 			<label for="operator_pages_style" class="flabel"><?php echo getlocal('settings.operator_pages_style') ?></label>
 			<div class="fvalue">
-				<select id="chatstyle" name="operator_pages_style" ><?php foreach($page['availableOperatorPagesStyles'] as $k) { echo "<option value=\"".$k."\"".($k == form_value("operatorpagesstyle") ? " selected=\"selected\"" : "").">".$k."</option>"; } ?></select>
+				<select id="operator_pages_style" name="operator_pages_style" ><?php foreach($page['availableOperatorPagesStyles'] as $k) { echo "<option value=\"".$k."\"".($k == form_value("operatorpagesstyle") ? " selected=\"selected\"" : "").">".$k."</option>"; } ?></select>
 			</div>
 			<label for="operator_pages_style" class="fdescr"> &mdash; <?php echo getlocal('settings.operator_pages_style.description') ?></label>
 			<br clear="all"/>
 		</div>
 
 		<div class="field">
-			<label for="chatstyle" class="flabel"><?php echo getlocal('settings.chatstyle') ?></label>
+			<label for="chat_style" class="flabel"><?php echo getlocal('settings.chatstyle') ?></label>
 			<div class="fvalue">
-				<select id="chatstyle" name="chatstyle" ><?php foreach($page['availableChatStyles'] as $k) { echo "<option value=\"".$k."\"".($k == form_value("chatstyle") ? " selected=\"selected\"" : "").">".$k."</option>"; } ?></select>
+				<select id="chat_style" name="chat_style" ><?php foreach($page['availableChatStyles'] as $k) { echo "<option value=\"".$k."\"".($k == form_value("chatstyle") ? " selected=\"selected\"" : "").">".$k."</option>"; } ?></select>
 			</div>
-			<label for="chatstyle" class="fdescr"> &mdash; <?php echo getlocal('settings.chatstyle.description') ?></label>
+			<label for="chat_style" class="fdescr"> &mdash; <?php echo getlocal('settings.chatstyle.description') ?></label>
 			<br clear="all"/>
 		</div>
 <?php if ($page['enabletracking']) { ?>