diff --git a/src/mibew/js/source/chat_popup.js b/src/mibew/js/source/chat_popup.js
index 4083d664..5c7042f6 100644
--- a/src/mibew/js/source/chat_popup.js
+++ b/src/mibew/js/source/chat_popup.js
@@ -416,7 +416,7 @@ var Mibew = Mibew || {};
             this.toggleDiv.className = 'mibew-chat-frame-toggle mibew-chat-frame-toggle-on';
             Mibew.Utils.addEventListener(this.toggleDiv, 'click', function(event) {
                 var popups = Mibew.Objects.ChatPopups,
-                matches = /^mibew-chat-frame-toggle-([0-9A-Za-z]+)$/.exec(this.id);
+                    matches = /^mibew-chat-frame-toggle-([0-9A-Za-z]+)$/.exec(this.id);
 
                 if (matches && popups[matches[1]]) {
                     popups[matches[1]].toggle();
diff --git a/src/mibew/js/source/default/utils.js b/src/mibew/js/source/default/utils.js
index 6f5f53c1..807f3eb1 100644
--- a/src/mibew/js/source/default/utils.js
+++ b/src/mibew/js/source/default/utils.js
@@ -180,11 +180,11 @@
      */
 
     var sanitizeMessage = function(message) {
-    return message.replace(/&/g, "&")
-                  .replace(/</g, "&lt;")
-                  .replace(/>/g, "&gt;")
-                  .replace(/"/g, "&quot;")
-                  .replace(/'/g, "&#039;");
+        return message.replace(/&/g, "&amp;")
+                      .replace(/</g, "&lt;")
+                      .replace(/>/g, "&gt;")
+                      .replace(/"/g, "&quot;")
+                      .replace(/'/g, "&#039;");
     };
 
     /**
diff --git a/src/mibew/js/source/mibewapi.js b/src/mibew/js/source/mibewapi.js
index 0a4cd59f..81c3d1f4 100644
--- a/src/mibew/js/source/mibewapi.js
+++ b/src/mibew/js/source/mibewapi.js
@@ -91,7 +91,7 @@ MibewAPI.prototype.checkFunction = function(functionObject, filterReservedFuncti
             // Work with own properties only.
             continue;
         }
-        for (var i = 0; i < mandatoryArgumentsList.length; i++) {
+        for (i = 0; i < mandatoryArgumentsList.length; i++) {
             if (argName == mandatoryArgumentsList[i]) {
                 mandatoryArgumentsCount++;
                 continue argumentsLoop;
@@ -358,7 +358,7 @@ MibewAPIInteraction.prototype.getMandatoryArguments = function(functionName) {
     }
     // Add mandatory arguments for given function
     if (typeof allMandatoryArguments[functionName] == 'object') {
-        for (var arg in allMandatoryArguments[functionName]) {
+        for (arg in allMandatoryArguments[functionName]) {
             if (! allMandatoryArguments[functionName].hasOwnProperty(arg)) {
                 continue;
             }
@@ -389,7 +389,7 @@ MibewAPIInteraction.prototype.getMandatoryArgumentsDefaults = function(functionN
     }
     // Add mandatory arguments for given function
     if (typeof allMandatoryArguments[functionName] == 'object') {
-        for (var arg in allMandatoryArguments[functionName]) {
+        for (arg in allMandatoryArguments[functionName]) {
             if (! allMandatoryArguments[functionName].hasOwnProperty(arg)) {
                 continue;
             }
diff --git a/src/mibew/js/source/operator_permissions.js b/src/mibew/js/source/operator_permissions.js
index b71dcdc0..b95d15f5 100644
--- a/src/mibew/js/source/operator_permissions.js
+++ b/src/mibew/js/source/operator_permissions.js
@@ -21,7 +21,7 @@
         $('#permissionsForm').submit(function(e){
             if (!$('#permissionsadmin').is(":checked")) {
                 e.preventDefault();
-                message = Mibew.Localization.trans(
+                var message = Mibew.Localization.trans(
                         'This action is irreversible, proceed anyway?'
                 );
                 Mibew.Utils.confirm(message, function(value) {
diff --git a/src/mibew/js/source/users/collection_views/threads_collection.js b/src/mibew/js/source/users/collection_views/threads_collection.js
index 28ff2027..fda6dc98 100644
--- a/src/mibew/js/source/users/collection_views/threads_collection.js
+++ b/src/mibew/js/source/users/collection_views/threads_collection.js
@@ -148,7 +148,7 @@
                     }
 
                     // Add styles names to DOM element
-                    for(var i = 0, l = childView.lastStyles.length; i < l; i++) {
+                    for(i = 0, l = childView.lastStyles.length; i < l; i++) {
                         childView.$el.addClass(childView.lastStyles[i]);
                     }
                 }