diff --git a/scm-webapp/src/main/webapp/resources/js/config/sonia.config.configform.js b/scm-webapp/src/main/webapp/resources/js/config/sonia.config.configform.js
index bcbeff5f92..3598045799 100644
--- a/scm-webapp/src/main/webapp/resources/js/config/sonia.config.configform.js
+++ b/scm-webapp/src/main/webapp/resources/js/config/sonia.config.configform.js
@@ -73,7 +73,7 @@ Sonia.config.ConfigForm = Ext.extend(Ext.form.FormPanel, {
         },
         listeners: {
           render: function(){
-            if ( this.onLoad !== null && Ext.isFunction( this.onLoad ) ){
+            if ( this.onLoad && Ext.isFunction( this.onLoad ) ){
               this.onLoad(this.el);
             }
           },
@@ -108,7 +108,7 @@ Sonia.config.ConfigForm = Ext.extend(Ext.form.FormPanel, {
 
   submitForm: function(){
     var form = this.getForm();
-    if ( this.onSubmit !== null && Ext.isFunction( this.onSubmit ) ){
+    if ( this.onSubmit && Ext.isFunction( this.onSubmit ) ){
       this.onSubmit( form.getValues() );
     }
   }
diff --git a/scm-webapp/src/main/webapp/resources/js/group/sonia.group.grid.js b/scm-webapp/src/main/webapp/resources/js/group/sonia.group.grid.js
index c6be5f151a..a7f269ee35 100644
--- a/scm-webapp/src/main/webapp/resources/js/group/sonia.group.grid.js
+++ b/scm-webapp/src/main/webapp/resources/js/group/sonia.group.grid.js
@@ -105,7 +105,7 @@ Sonia.group.Grid = Ext.extend(Sonia.rest.Grid, {
 
   renderMembers: function(members){
     var out = '';
-    if ( members !== null ){
+    if ( members ){
       var s = members.length;
       for ( var i=0; i<s; i++ ){
         out += members[i];
diff --git a/scm-webapp/src/main/webapp/resources/js/group/sonia.group.memberformpanel.js b/scm-webapp/src/main/webapp/resources/js/group/sonia.group.memberformpanel.js
index c0bd17716f..8a746616ae 100644
--- a/scm-webapp/src/main/webapp/resources/js/group/sonia.group.memberformpanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/group/sonia.group.memberformpanel.js
@@ -69,9 +69,9 @@ Sonia.group.MemberFormPanel = Ext.extend(Sonia.group.FormPanel, {
       singleSelect: true
     });
 
-    if ( this.item !== null ){
+    if ( this.item ){
       var data = [];
-      if ( this.item.members !== null ){
+      if ( this.item.members ){
         for ( var i=0; i<this.item.members.length; i++ ){
           var a = [];
           a.push( this.item.members[i] );
diff --git a/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navpanel.js b/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navpanel.js
index c1d62d38fc..9d3e44f414 100644
--- a/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navpanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navpanel.js
@@ -49,7 +49,7 @@ Sonia.navigation.NavPanel = Ext.extend(Ext.Panel, {
   },
 
   renderSections: function(){
-    if ( this.sections !== null ){
+    if ( this.sections ){
       this.addSections( this.sections );
     }
   },
diff --git a/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navsection.js b/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navsection.js
index 17ac3d51e1..a97c4e3ce3 100644
--- a/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navsection.js
+++ b/scm-webapp/src/main/webapp/resources/js/navigation/sonia.navigation.navsection.js
@@ -44,10 +44,10 @@ Sonia.navigation.NavSection = Ext.extend(Ext.Panel, {
 
 
   initComponent: function(){
-    if ( this.links === null ){
+    if ( ! this.links ){
       this.links = this.items;
     }
-    if ( this.links === null ){
+    if ( ! this.links ){
       this.links = [];
     }
 
diff --git a/scm-webapp/src/main/webapp/resources/js/override/ext.util.format.js b/scm-webapp/src/main/webapp/resources/js/override/ext.util.format.js
index c0e3429144..1a13c3dfa7 100644
--- a/scm-webapp/src/main/webapp/resources/js/override/ext.util.format.js
+++ b/scm-webapp/src/main/webapp/resources/js/override/ext.util.format.js
@@ -33,9 +33,9 @@ Ext.apply(Ext.util.Format, {
 
   formatTimestamp: function(value){
     var result = '';
-    if ( value !== null && (value > 0 || value.length > 0)){
+    if ( value && (value > 0 || value.length > 0)){
       var df = state.clientConfig.dateFormat;
-      if ( df === null || df.length === 0 || ! Ext.isDefined(value) ){
+      if ( ! df || df.length === 0 || ! Ext.isDefined(value) ){
         df = "YYYY-MM-DD HH:mm:ss";
       }
       result = moment(value).format(df);
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.blamepanel.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.blamepanel.js
index efd7db40a1..6ca0d651ce 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.blamepanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.blamepanel.js
@@ -96,7 +96,7 @@ Sonia.repository.BlamePanel = Ext.extend(Ext.grid.GridPanel, {
   
   onClick: function(e){
     var el = e.getTarget('.blame-link');
-    if ( el !== null ){
+    if ( el ){
       var revision = el.rel;
       if (debug){
         console.debug('load content for ' + revision);
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.changesetviewergrid.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.changesetviewergrid.js
index 4131c6bff2..22ee81471f 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.changesetviewergrid.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.changesetviewergrid.js
@@ -167,18 +167,18 @@ Sonia.repository.ChangesetViewerGrid = Ext.extend(Ext.grid.GridPanel, {
 
   renderChangesetMetadata: function(author, p, record){
     var authorValue = '';
-    if ( author !== null ){
+    if ( author ){
       authorValue = author.name;
-      if ( author.mail !== null ){
+      if ( author.mail ){
         authorValue += ' ' + String.format(this.mailTemplate, author.mail);
       }
     }
     var description = record.data.description;
-    // if ( description != null ){
+    // if ( description ){
     //  description = Ext.util.Format.htmlEncode(description);
     // }
     var date = record.data.date;
-    if ( date !== null ){
+    if ( date ){
       date = Ext.util.Format.formatTimestamp(date);
     }
     return String.format(
@@ -198,7 +198,7 @@ Sonia.repository.ChangesetViewerGrid = Ext.extend(Ext.grid.GridPanel, {
 
   getLabeledValue: function(label, array){
     var result = '';
-    if ( array !== null && array.length > 0 ){
+    if ( array && array.length > 0 ){
       result = label + ': ' + Sonia.util.getStringFromArray(array);
     }
     return result;
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.contentpanel.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.contentpanel.js
index cc73ec2069..36622a55ed 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.contentpanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.contentpanel.js
@@ -172,7 +172,7 @@ Sonia.repository.ContentPanel = Ext.extend(Ext.Panel, {
   
   appendRepositoryProperties: function(bar){
     bar.push('->',this.repository.name);
-    if ( this.revision !== null ){
+    if ( this.revision ){
       bar.push(': ', this.revision);
     }
   },
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.extendedinfopanel.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.extendedinfopanel.js
index 15b2d301fe..062c93aefa 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.extendedinfopanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.extendedinfopanel.js
@@ -45,7 +45,7 @@ Sonia.repository.ExtendedInfoPanel = Ext.extend(Sonia.repository.InfoPanel,{
   
   modifyDefaultConfig: function(config){
     var items = config.items;
-    if ( items === null ){
+    if ( ! items ){
       items = [];
     }
     items.push({
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.infopanel.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.infopanel.js
index 755e4def23..45f9a06dc2 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.infopanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.infopanel.js
@@ -47,7 +47,7 @@ Sonia.repository.InfoPanel = Ext.extend(Ext.Panel, {
   initComponent: function(){
     
     var contact = '';
-    if ( this.item.contact !== null ){
+    if ( this.item.contact ){
       contact = String.format(this.mailTemplate, this.item.contact);
     }
     
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.js
index d1224da20b..c962c24ae5 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.js
@@ -71,7 +71,7 @@ Sonia.repository.createContentId = function(repository, path, revision){
 };
 
 Sonia.repository.isOwner = function(repository){
-  return admin || repository.permissions !== null;
+  return admin || repository.permissions;
 };
 
 Sonia.repository.setEditPanel = function(panels){
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.permissionformpanel.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.permissionformpanel.js
index ef2229a4aa..4670ddf9b1 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.permissionformpanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.permissionformpanel.js
@@ -121,8 +121,8 @@ Sonia.repository.PermissionFormPanel = Ext.extend(Sonia.repository.FormPanel, {
         }
     });
 
-    if ( this.item !== null ){
-      if ( this.item.permissions === null ){
+    if ( this.item ){
+      if ( !this.item.permissions ){
         this.item.permissions = [];
       }
       this.permissionStore.loadData( this.item );
diff --git a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.repositorybrowser.js b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.repositorybrowser.js
index 200524e6a8..2fff4dc1c4 100644
--- a/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.repositorybrowser.js
+++ b/scm-webapp/src/main/webapp/resources/js/repository/sonia.repository.repositorybrowser.js
@@ -207,7 +207,7 @@ Sonia.repository.RepositoryBrowser = Ext.extend(Ext.grid.GridPanel, {
   
   loadStore: function(store, records, extra){
     var path = extra.params.path;
-    if ( path !== null && path.length > 0 ){
+    if ( path && path.length > 0 ){
       
       var index = path.lastIndexOf('/');
       if ( index > 0 ){
@@ -240,7 +240,7 @@ Sonia.repository.RepositoryBrowser = Ext.extend(Ext.grid.GridPanel, {
   onClick: function(e){
     var el = e.getTarget('.scm-browser');
     
-    if ( el !== null ){
+    if ( el ){
     
       var rel = el.rel;
       var index = rel.indexOf(':');
@@ -288,7 +288,7 @@ Sonia.repository.RepositoryBrowser = Ext.extend(Ext.grid.GridPanel, {
   
   appendRepositoryProperties: function(bar){
     bar.push('->',this.repository.name);
-    if ( this.revision !== null ){
+    if ( this.revision ){
       bar.push(': ', this.revision);
     }
   },
@@ -381,7 +381,7 @@ Sonia.repository.RepositoryBrowser = Ext.extend(Ext.grid.GridPanel, {
     }
     
     items.push('->', this.repository.name);
-    if ( this.revision !== null ){
+    if ( this.revision ){
       items.push(':', this.revision);
     }
     
diff --git a/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.formpanel.js b/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.formpanel.js
index 54fcd9e4ff..eabea80386 100644
--- a/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.formpanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.formpanel.js
@@ -61,7 +61,7 @@ Sonia.rest.FormPanel = Ext.extend(Ext.form.FormPanel,{
     Ext.apply(this, Ext.apply(this.initialConfig, config));
     Sonia.rest.FormPanel.superclass.initComponent.apply(this, arguments);
 
-    if ( this.item !== null ){
+    if ( this.item ){
       this.loadData(this.item);
     }
   },
diff --git a/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.grid.js b/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.grid.js
index 9fda9a7ad9..9f05a75375 100644
--- a/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.grid.js
+++ b/scm-webapp/src/main/webapp/resources/js/rest/sonia.rest.grid.js
@@ -119,7 +119,7 @@ Sonia.rest.Grid = Ext.extend(Ext.grid.GridPanel, {
 
   renderUrl: function(url){
     var result = '';
-    if ( url !== null ){
+    if ( url ){
       result = String.format( this.urlTemplate, url );
     }
     return result;
@@ -127,7 +127,7 @@ Sonia.rest.Grid = Ext.extend(Ext.grid.GridPanel, {
 
   renderMailto: function(mail){
     var result = '';
-    if ( mail !== null ){
+    if ( mail ){
       result = String.format( this.mailtoTemplate, mail );
     }
     return result;
diff --git a/scm-webapp/src/main/webapp/resources/js/sonia.scm.js b/scm-webapp/src/main/webapp/resources/js/sonia.scm.js
index 0c9617d372..bfab4abfcb 100644
--- a/scm-webapp/src/main/webapp/resources/js/sonia.scm.js
+++ b/scm-webapp/src/main/webapp/resources/js/sonia.scm.js
@@ -99,7 +99,7 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
   getInfoPanel: function(type){
     var rp = null;
     var panel = this.infoPanels[type];
-    if ( panel === null ){
+    if ( ! panel ){
       rp = {
         xtype: 'repositoryInfoPanel'
       };
@@ -224,7 +224,7 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
         }]
       }]);
 
-      if ( securitySection === null ){
+      if ( ! securitySection ){
         securitySection = {
           id: 'securityConfig',
           title: this.sectionSecurityText,
@@ -243,7 +243,7 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
       });
     }
 
-    if ( securitySection !== null ){
+    if ( securitySection ){
       panel.addSection( securitySection );
     }
 
@@ -291,7 +291,7 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
 
   addTab: function(panel){
     var tab = this.mainTabPanel.findById(panel.id);
-    if ( tab === null ){
+    if ( !tab ){
       this.mainTabPanel.add(panel);
     }
     this.mainTabPanel.setActiveTab(panel.id);
@@ -362,10 +362,10 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
 
         var s = null;
         var text = response.responseText;
-        if ( text !== null && text.length > 0 ){
+        if ( text && text.length > 0 ){
           s = Ext.decode( text );
         }
-        if ( s !== null && s.success ){
+        if ( s && s.success ){
           this.loadState(s);
         } else {
           // show login window
@@ -428,10 +428,10 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
         buttons: Ext.Msg.OKCANCEL
       });      
     } else {
-      if ( title === null ){
+      if ( ! title ){
         title = this.errorTitle;
       }
-      if ( message === null ){
+      if ( ! message ){
         message = this.errorMessage;
       }
 
@@ -454,7 +454,7 @@ Sonia.scm.Main = Ext.extend(Ext.util.Observable, {
       
       message = String.format(message, status);
       
-      if ( text === null ){
+      if ( ! text ){
 
         Ext.MessageBox.show({
           title: title,
diff --git a/scm-webapp/src/main/webapp/resources/js/user/sonia.user.formpanel.js b/scm-webapp/src/main/webapp/resources/js/user/sonia.user.formpanel.js
index c52f262de4..827189a97c 100644
--- a/scm-webapp/src/main/webapp/resources/js/user/sonia.user.formpanel.js
+++ b/scm-webapp/src/main/webapp/resources/js/user/sonia.user.formpanel.js
@@ -75,7 +75,7 @@ Sonia.user.FormPanel = Ext.extend(Sonia.rest.FormPanel,{
       helpText: this.mailHelpText
     }];
 
-    if ( this.item === null || this.item.type === state.defaultUserType ){
+    if ( ! this.item || this.item.type === state.defaultUserType ){
       items.push({
         fieldLabel: this.passwordText,
         id: 'pwd',
@@ -115,7 +115,7 @@ Sonia.user.FormPanel = Ext.extend(Sonia.rest.FormPanel,{
   },
   
   isReadOnly: function(){
-    return this.item !== null && this.item.type !== state.defaultUserType;
+    return this.item && this.item.type !== state.defaultUserType;
   },
 
   fixRequest: function(user){
diff --git a/scm-webapp/src/main/webapp/resources/js/util/sonia.util.js b/scm-webapp/src/main/webapp/resources/js/util/sonia.util.js
index 826be5c096..d220bf7161 100644
--- a/scm-webapp/src/main/webapp/resources/js/util/sonia.util.js
+++ b/scm-webapp/src/main/webapp/resources/js/util/sonia.util.js
@@ -182,7 +182,7 @@ if (!Array.prototype.filter) {
 
 Sonia.util.getProperty = function(properties, key){
   var value = null;
-  if ( properties !== null ){
+  if ( properties ){
     for (var i=0; i<properties.length; i++){
       var property = properties[i];
       if ( property.key === key ){