diff --git a/scm-webapp/src/main/java/sonia/scm/plugin/DefaultPluginManager.java b/scm-webapp/src/main/java/sonia/scm/plugin/DefaultPluginManager.java
index 3d584a5fcf..78f1aadb03 100644
--- a/scm-webapp/src/main/java/sonia/scm/plugin/DefaultPluginManager.java
+++ b/scm-webapp/src/main/java/sonia/scm/plugin/DefaultPluginManager.java
@@ -56,7 +56,9 @@ import java.net.URL;
 
 import java.util.Collection;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import javax.xml.bind.JAXBContext;
 import javax.xml.bind.JAXBException;
@@ -199,7 +201,18 @@ public class DefaultPluginManager implements PluginManager
   {
     SecurityUtil.assertIsAdmin(securityContextProvicer);
 
-    return getPluginCenter().getPlugins();
+    Set<PluginInformation> availablePlugins = new HashSet<PluginInformation>();
+    Set<PluginInformation> centerPlugins = getPluginCenter().getPlugins();
+
+    for (PluginInformation info : centerPlugins)
+    {
+      if (!installedPlugins.containsKey(info.getId()))
+      {
+        availablePlugins.add(info);
+      }
+    }
+
+    return availablePlugins;
   }
 
   /**
diff --git a/scm-webapp/src/main/webapp/resources/js/sonia.plugin.js b/scm-webapp/src/main/webapp/resources/js/sonia.plugin.js
index ec801b2847..bd9c688ff3 100644
--- a/scm-webapp/src/main/webapp/resources/js/sonia.plugin.js
+++ b/scm-webapp/src/main/webapp/resources/js/sonia.plugin.js
@@ -87,7 +87,8 @@ Sonia.plugin.InstalledGrid = Ext.extend(Sonia.rest.Grid, {
     var config = {
       autoExpandColumn: 'description',
       store: pluginStore,
-      colModel: pluginColModel
+      colModel: pluginColModel,
+      emptyText: 'No plugin is installed'
     };
 
 
@@ -100,6 +101,32 @@ Sonia.plugin.InstalledGrid = Ext.extend(Sonia.rest.Grid, {
 // register xtype
 Ext.reg('installedPluginsGrid', Sonia.plugin.InstalledGrid);
 
+// loading window
+
+Sonia.plugin.LoadingWindow = Ext.extend(Ext.Window,{
+
+  initComponent: function(){
+
+    var config = {
+      layout:'fit',
+      width:300,
+      height:150,
+      closable: false,
+      resizable: false,
+      plain: true,
+      border: false,
+      modal: true,
+      items: [{
+        xtype: 'progress'
+      }]
+    };
+
+    Ext.apply(this, Ext.apply(this.initialConfig, config));
+    Sonia.login.Window.superclass.initComponent.apply(this, arguments);
+  }
+
+});
+
 // available plugins grid
 
 Sonia.plugin.AvailableGrid = Ext.extend(Sonia.rest.Grid,{
@@ -129,7 +156,8 @@ Sonia.plugin.AvailableGrid = Ext.extend(Sonia.rest.Grid,{
     var config = {
       autoExpandColumn: 'description',
       store: pluginStore,
-      colModel: pluginColModel
+      colModel: pluginColModel,
+      emptyText: 'No plugin available'
     };
 
     this.on('cellclick', this.cellClick);
@@ -153,6 +181,37 @@ Sonia.plugin.AvailableGrid = Ext.extend(Sonia.rest.Grid,{
     if ( debug ){
       console.debug( 'install plugin ' + pluginId );
     }
+
+    var loadingBox = Ext.MessageBox.show({
+        title: 'Please wait',
+        msg: 'Installing Plugin.',
+        width: 300,
+        wait: true,
+        animate: true,
+        progress: true,
+        closable: false
+    });
+
+    Ext.Ajax.request({
+      url: restUrl + 'plugins/available/' + pluginId + '.json',
+      method: 'POST',
+      scope: this,
+      success: function(){
+        if ( debug ){
+          console.debug('plugin successfully installed');
+        }
+        loadingBox.hide();
+        Ext.MessageBox.alert('Plugin successfully installed',
+          'Restart the applicationserver to activate the plugin.');
+      },
+      failure: function(){
+        if ( debug ){
+          console.debug('plugin installation failed');
+        }
+        alert( 'failure' );
+        loadingBox.hide();
+      }
+    });
   }
 
 });
diff --git a/scm-webapp/src/main/webapp/resources/js/sonia.repository.js b/scm-webapp/src/main/webapp/resources/js/sonia.repository.js
index 499ae1a7da..bedd122b73 100644
--- a/scm-webapp/src/main/webapp/resources/js/sonia.repository.js
+++ b/scm-webapp/src/main/webapp/resources/js/sonia.repository.js
@@ -128,7 +128,8 @@ Sonia.repository.Grid = Ext.extend(Sonia.rest.Grid, {
     var config = {
       autoExpandColumn: 'description',
       store: repositoryStore,
-      colModel: repositoryColModel
+      colModel: repositoryColModel,
+      emptyText: 'No repository is configured'
     };
 
     Ext.apply(this, Ext.apply(this.initialConfig, config));
diff --git a/scm-webapp/src/main/webapp/resources/js/sonia.rest.js b/scm-webapp/src/main/webapp/resources/js/sonia.rest.js
index cc0b73e431..fa5adf7fe8 100644
--- a/scm-webapp/src/main/webapp/resources/js/sonia.rest.js
+++ b/scm-webapp/src/main/webapp/resources/js/sonia.rest.js
@@ -66,6 +66,7 @@ Sonia.rest.Grid = Ext.extend(Ext.grid.GridPanel, {
   urlTemplate: '<a href="{0}" target="_blank">{0}</a>',
   mailtoTemplate: '<a href="mailto: {0}">{0}</a>',
   checkboxTemplate: '<input type="checkbox" disabled="true" {0}/>',
+  emptyText: 'No items available',
 
   initComponent: function(){
 
@@ -82,7 +83,11 @@ Sonia.rest.Grid = Ext.extend(Ext.grid.GridPanel, {
 
     var config = {
       loadMask: true,
-      sm: selectionModel
+      sm: selectionModel,
+      viewConfig: {
+        deferEmptyText: false,
+        emptyText: this.emptyText
+      }
     };
 
     Ext.apply(this, Ext.apply(this.initialConfig, config));
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 f8d01e89cf..cdd533088c 100644
--- a/scm-webapp/src/main/webapp/resources/js/sonia.scm.js
+++ b/scm-webapp/src/main/webapp/resources/js/sonia.scm.js
@@ -134,13 +134,17 @@ Ext.onReady(function(){
           fn: function(){
             addTabPanel('repositoryConfig', 'repositoryConfig', 'Repository Config');
           }
-        },{
-          label: 'Installed Plugins',
+        }]
+      },{
+        id: 'navPlugins',
+        title: 'Plugins',
+        items: [{
+          label: 'Installed',
           fn: function(){
             addTabPanel('installedPlugins', 'installedPluginsGrid', 'Installed Plugins')
           }
         },{
-          label: 'Available Plugins',
+          label: 'Available',
           fn: function(){
             addTabPanel('availablePlugins', 'availablePluginsGrid', 'Available Plugins')
           }