diff --git a/src/messenger/webim/client.php b/src/messenger/webim/client.php
index a1fe7347..8ce25924 100644
--- a/src/messenger/webim/client.php
+++ b/src/messenger/webim/client.php
@@ -175,6 +175,11 @@ $pparam = verifyparam( "act", "/^(mailthread)$/", "default");
 if( $pparam == "mailthread" ) {
 	expand("styles/dialogs", getchatstyle(), "mail.tpl");
 } else if( $level == "ajaxed" ) {
+	// Load JavaScript plugins and JavaScripts, CSS files required by them
+	$page['additional_css'] = get_additional_css('chatWindow');
+	$page['additional_js'] = get_additional_js('chatWindow');
+	$page['js_plugins'] = get_js_plugins('chatWindow');
+	// Expand page
 	expand("styles/dialogs", getchatstyle(), "chat.tpl");
 } else if( $level == "simple" ) {
 	expand("styles/dialogs", getchatstyle(), "chatsimple.tpl");
diff --git a/src/messenger/webim/js/164/chat.js b/src/messenger/webim/js/164/chat.js
index d3d2926f..81577ef1 100644
--- a/src/messenger/webim/js/164/chat.js
+++ b/src/messenger/webim/js/164/chat.js
@@ -26,5 +26,6 @@ arguments:{references:{},"return":{closed:"closed"},threadId:this.thread.threadi
 this.setStatus(a.errorMessage):this.setStatus("reconnecting")},showStatusDiv:function(a){$("engineinfo")&&($("engineinfo").style.display="inline",$("engineinfo").innerHTML=a)},setStatus:function(a){this.statusTimeout&&clearTimeout(this.statusTimeout);this.showStatusDiv(a);this.statusTimeout=setTimeout(this.clearStatus.bind(this),4E3)},clearStatus:function(){$("engineinfo").style.display="none"}};
 var Chat={threadUpdater:{},applyName:function(){Chat.threadUpdater.changeName($("uname").value);$("changename1").style.display="none";$("changename2").style.display="inline";$("unamelink").innerHTML=htmlescape($("uname").value)},showNameField:function(){$("changename1").style.display="inline";$("changename2").style.display="none"}};
 Behaviour.register({"#postmessage a":function(a){a.onclick=function(){var a=$("msgwnd");a&&Chat.threadUpdater.postMessage(a.value)}},"select#predefined":function(a){a.onchange=function(){var a=$("msgwnd");0!=this.selectedIndex&&(a.value=Chat.predefinedAnswers[this.selectedIndex-1]);this.selectedIndex=0;a.focus()}},"div#changename2 a":function(a){a.onclick=function(){Chat.showNameField();return!1}},"div#changename1 a":function(a){a.onclick=function(){Chat.applyName();return!1}},"div#changename1 input#uname":function(a){a.onkeydown=
-function(a){13==(a||event).keyCode&&Chat.applyName()}},"a#refresh":function(a){a.onclick=function(){Chat.threadUpdater.refresh()}},"a#togglesound":function(a){a.onclick=function(){var a=$("soundimg");a&&(a.className=a.className.match(/\bisound\b/)?"tplimage inosound":"tplimage isound",(a=$("msgwnd"))&&a.focus())}},"a.closethread":function(a){a.onclick=function(){Chat.threadUpdater.closeThread()}}});
-EventHelper.register(window,"onload",function(){Chat.cssfile=chatParams.cssfile;Chat.predefinedAnswers=chatParams.predefinedAnswers||[];Chat.localizedStrings=chatParams.localizedStrings;Chat.threadUpdater=new ChatThreadUpdater(new ChatServer(chatParams.serverParams),chatParams.threadParams,{ignorectrl:-1,container:"safari"==myRealAgent?self.frames[0]:$("chatwnd"),avatar:$("avatarwnd"),message:$("msgwnd")}.extend(chatParams.threadUpdaterParams||{}))});
+function(a){13==(a||event).keyCode&&Chat.applyName()}},"a#refresh":function(a){a.onclick=function(){Chat.threadUpdater.refresh()}},"a#togglesound":function(a){a.onclick=function(){var a=$("soundimg");a&&(a.className=a.className.match(/\bisound\b/)?"tplimage inosound":"tplimage isound",(a=$("msgwnd"))&&a.focus())}},"a.closethread":function(a){a.onclick=function(){Chat.threadUpdater.closeThread()}}});var pluginManager=new PluginManager;
+EventHelper.register(window,"onload",function(){var a=new ChatServer(chatParams.serverParams),b=chatParams.threadParams;chatParams.initPlugins(pluginManager,b,a);Chat.cssfile=chatParams.cssfile;Chat.predefinedAnswers=chatParams.predefinedAnswers||[];Chat.localizedStrings=chatParams.localizedStrings;Chat.threadUpdater=new ChatThreadUpdater(a,b,{ignorectrl:-1,container:"safari"==myRealAgent?self.frames[0]:$("chatwnd"),avatar:$("avatarwnd"),message:$("msgwnd")}.extend(chatParams.threadUpdaterParams||
+{}))});
\ No newline at end of file
diff --git a/src/messenger/webim/js/source/chat.js b/src/messenger/webim/js/source/chat.js
index 7c2bf912..c25c21b9 100644
--- a/src/messenger/webim/js/source/chat.js
+++ b/src/messenger/webim/js/source/chat.js
@@ -927,13 +927,18 @@ Behaviour.register({
 	}
 });
 
+var pluginManager = new PluginManager();
+
 EventHelper.register(window, 'onload', function(){
+  var chatServer = new ChatServer(chatParams.serverParams);
+  var thread = chatParams.threadParams;
+  chatParams.initPlugins(pluginManager, thread, chatServer);
   Chat.cssfile = chatParams.cssfile;
   Chat.predefinedAnswers = chatParams.predefinedAnswers || [];
   Chat.localizedStrings = chatParams.localizedStrings;
   Chat.threadUpdater = new ChatThreadUpdater(
-    new ChatServer(chatParams.serverParams),
-    chatParams.threadParams,
+    chatServer,
+    thread,
     {
         ignorectrl: -1,
         container: myRealAgent=='safari'?self.frames[0]:$("chatwnd"),
diff --git a/src/messenger/webim/libs/common/response.php b/src/messenger/webim/libs/common/response.php
index 351436ce..e18c8427 100644
--- a/src/messenger/webim/libs/common/response.php
+++ b/src/messenger/webim/libs/common/response.php
@@ -64,6 +64,81 @@ function topage($text)
 	return myiconv($webim_encoding, getoutputenc(), $text);
 }
 
+/**
+ * Load additional CSS files, required by plugins, and build HTML code to include them
+ *
+ * @param string $page_name CSS files load to this page
+ * @return string HTML block of 'link' tags
+ */
+function get_additional_css($page_name) {
+	$method = $page_name . 'AddCss';
+	$plugins = PluginManager::getAllPlugins();
+	$result = array();
+	// Check all plugins
+	foreach ($plugins as $plugin) {
+		if (is_callable(array($plugin, $method))) {
+			// Try to invoke '<$page_name>AddCss' method
+			$css_list = $plugin->$method();
+			foreach ($css_list as $css) {
+				// Add script tag for each javascript file
+				$result[] = '<link rel="stylesheet" type="text/css" href="' . $css . '">';
+			}
+		}
+	}
+	return implode("\n", $result);
+}
+
+/**
+ * Load additional JavaScript files, required by plugins, and build HTML code to include them
+ *
+ * @param string $page_name JavaScript files load to this page
+ * @return string HTML block of 'script' tags
+ */
+function get_additional_js($page_name) {
+	$method = $page_name . 'AddJs';
+	$plugins = PluginManager::getAllPlugins();
+	$result = array();
+	// Check all plugins
+	foreach ($plugins as $plugin) {
+		if (is_callable(array($plugin, $method))) {
+			// Try to invoke '<$page_name>AddJs' method
+			$js_list = $plugin->$method();
+			foreach ($js_list as $js) {
+				// Add script tag for each javascript file
+				$result[] = '<script type="text/javascript" src="' . $js . '"></script>';
+			}
+		}
+	}
+	return implode("\n", $result);
+}
+
+/**
+ * Build Javascript code that initialize JavaScript plugins
+ *
+ * @param string $page_name Plugins initialize at this page
+ * @return string JavaScript initialization block
+ */
+function get_js_plugins($page_name) {
+	$method = $page_name . 'AddJsPlugins';
+	$plugins = PluginManager::getAllPlugins();
+	$result = array();
+	// Check all plugins
+	foreach ($plugins as $plugin) {
+		if (is_callable(array($plugin, $method))) {
+			// Try to invoke '<$page_name>AddJsPlugins' method
+			$js_plugins = $plugin->$method();
+			foreach ($js_plugins as $js_plugin) {
+				// Add plugin's initialization code
+				$constructor = $js_plugin['constructor'];
+				array_unshift($js_plugin['init_values'], 'thread', 'chatServer');
+				$init_values = implode(', ', $js_plugin['init_values']);
+				$result[] = "pluginManager.addPlugin('{$constructor}', new {$constructor}({$init_values}));";
+			}
+		}
+	}
+	return implode("\n", $result);
+}
+
 function no_field($key)
 {
 	return getlocal2("errors.required", array(getlocal($key)));
diff --git a/src/messenger/webim/operator/agent.php b/src/messenger/webim/operator/agent.php
index a25f7b88..80095f6f 100644
--- a/src/messenger/webim/operator/agent.php
+++ b/src/messenger/webim/operator/agent.php
@@ -124,6 +124,11 @@ if ($pparam == "redirect") {
 	setup_redirect_links($threadid, $operator, $token);
 	expand("../styles/dialogs", getchatstyle(), "redirect.tpl");
 } else {
+	// Load JavaScript plugins and JavaScripts, CSS files required by them
+	$page['additional_css'] = get_additional_css('chatWindow');
+	$page['additional_js'] = get_additional_js('chatWindow');
+	$page['js_plugins'] = get_js_plugins('chatWindow');
+	// Expand page
 	expand("../styles/dialogs", getchatstyle(), "chat.tpl");
 }
 
diff --git a/src/messenger/webim/plugins/.htaccess b/src/messenger/webim/plugins/.htaccess
index 14249c50..84e03cb0 100644
--- a/src/messenger/webim/plugins/.htaccess
+++ b/src/messenger/webim/plugins/.htaccess
@@ -1 +1,4 @@
-Deny from all
\ No newline at end of file
+Order Allow,Deny
+<FilesMatch "\.(js|css|jpe?g|gif|png|bmp)$">
+    Allow from all
+</FilesMatch>
\ No newline at end of file
diff --git a/src/messenger/webim/styles/dialogs/default/templates/chat.tpl b/src/messenger/webim/styles/dialogs/default/templates/chat.tpl
index b1792daa..295265ce 100644
--- a/src/messenger/webim/styles/dialogs/default/templates/chat.tpl
+++ b/src/messenger/webim/styles/dialogs/default/templates/chat.tpl
@@ -4,8 +4,11 @@
 <title>${msg:chat.window.title.agent}</title>
 <link rel="shortcut icon" href="${webimroot}/images/favicon.ico" type="image/x-icon">
 <link rel="stylesheet" type="text/css" href="${tplroot}/chat.css">
+${page:additional_css}
+${page:additional_js}
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/common.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/mibewapi.js"></script>
+<script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/pluginmanager.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/json2.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/brws.js"></script>
 <script type="text/javascript" language="javascript"><!--
@@ -27,6 +30,9 @@ var chatParams = {
         webimRoot: "${webimroot}",
         ignorectrl:${page:ignorectrl},
         localizedStrings: {closeConfirmation:"${page:chat.close.confirmation}"}
+    },
+    initPlugins: function(pluginManager, thread, chatServer) {
+        ${page:js_plugins}
     }
 }
 //-->
@@ -92,7 +98,6 @@ var chatParams = {
 
 </head>
 <body bgcolor="#FFFFFF" text="#000000" link="#C28400" vlink="#C28400" alink="#C28400" style="margin:0px;">
-
 <table width="100%" style="height:100%;" cellspacing="0" cellpadding="0" border="0">
 <tr>
 <td valign="top">
diff --git a/src/messenger/webim/styles/dialogs/original/templates/chat.tpl b/src/messenger/webim/styles/dialogs/original/templates/chat.tpl
index 297f351a..832695b7 100644
--- a/src/messenger/webim/styles/dialogs/original/templates/chat.tpl
+++ b/src/messenger/webim/styles/dialogs/original/templates/chat.tpl
@@ -4,8 +4,11 @@
 <title>${msg:chat.window.title.agent}</title>
 <link rel="shortcut icon" href="${webimroot}/images/favicon.ico" type="image/x-icon">
 <link rel="stylesheet" type="text/css" href="${tplroot}/chat.css">
+${page:additional_css}
+${page:additional_js}
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/common.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/mibewapi.js"></script>
+<script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/pluginmanager.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/json2.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/brws.js"></script>
 <script type="text/javascript" language="javascript"><!--
@@ -27,6 +30,9 @@ var chatParams = {
         webimRoot: "${webimroot}",
         ignorectrl:${page:ignorectrl},
         localizedStrings: {closeConfirmation:"${page:chat.close.confirmation}"}
+    },
+    initPlugins: function(pluginManager, thread, chatServer) {
+        ${page:js_plugins}
     }
 }
 //-->
diff --git a/src/messenger/webim/styles/dialogs/silver/templates/chat.tpl b/src/messenger/webim/styles/dialogs/silver/templates/chat.tpl
index d510060d..0e64cdeb 100644
--- a/src/messenger/webim/styles/dialogs/silver/templates/chat.tpl
+++ b/src/messenger/webim/styles/dialogs/silver/templates/chat.tpl
@@ -5,8 +5,11 @@
 	<title>${msg:chat.window.title.agent}</title>	
 	<link rel="shortcut icon" href="${webimroot}/images/favicon.ico" type="image/x-icon" />
 	<link rel="stylesheet" type="text/css" href="${tplroot}/chat.css" media="all" />
+        ${page:additional_css}
+        ${page:additional_js}
 	<script type="text/javascript" src="${webimroot}/js/${jsver}/common.js"></script>
         <script type="text/javascript" src="${webimroot}/js/${jsver}/mibewapi.js"></script>
+        <script type="text/javascript" src="${webimroot}/js/${jsver}/pluginmanager.js"></script>
         <script type="text/javascript" src="${webimroot}/js/${jsver}/json2.js"></script>
 	<script type="text/javascript" src="${webimroot}/js/${jsver}/brws.js"></script>
 	<script type="text/javascript">
@@ -29,6 +32,9 @@
                         webimRoot: "${webimroot}",
                         ignorectrl:${page:ignorectrl},
                         localizedStrings: {closeConfirmation:"${page:chat.close.confirmation}"}
+                    },
+                    initPlugins: function(pluginManager, thread, chatServer) {
+                        ${page:js_plugins}
                     }
                 }
 		var stxt = 10;
diff --git a/src/messenger/webim/styles/dialogs/simplicity/templates/chat.tpl b/src/messenger/webim/styles/dialogs/simplicity/templates/chat.tpl
index 51e3cc72..71945037 100644
--- a/src/messenger/webim/styles/dialogs/simplicity/templates/chat.tpl
+++ b/src/messenger/webim/styles/dialogs/simplicity/templates/chat.tpl
@@ -4,8 +4,11 @@
 <title>${msg:chat.window.title.agent}</title>
 <link rel="shortcut icon" href="${webimroot}/images/favicon.ico" type="image/x-icon">
 <link rel="stylesheet" type="text/css" href="${tplroot}/chat.css">
+${page:additional_css}
+${page:additional_js}
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/common.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/mibewapi.js"></script>
+<script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/pluginmanager.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/json2.js"></script>
 <script type="text/javascript" language="javascript" src="${webimroot}/js/${jsver}/brws.js"></script>
 <script type="text/javascript" language="javascript"><!--
@@ -27,6 +30,9 @@ var chatParams = {
         webimRoot: "${webimroot}",
         ignorectrl:${page:ignorectrl},
         localizedStrings: {closeConfirmation:"${page:chat.close.confirmation}"}
+    },
+    initPlugins: function(pluginManager, thread, chatServer) {
+        ${page:js_plugins}
     }
 }
 //-->