diff --git a/client/WEB-INF/classes/resources/resource.properties b/client/WEB-INF/classes/resources/resource.properties
index 62da1566506..02c986fb4ea 100644
--- a/client/WEB-INF/classes/resources/resource.properties
+++ b/client/WEB-INF/classes/resources/resource.properties
@@ -51,6 +51,7 @@ no.available.iso = No Available ISO
 your.session.has.expired = Your session has expired
 internet.name.can.not.be.resolved = Internet name can not be resolved
 management.server.is.not.accessible = Management server is not accessible
+please.select.at.least.one.item.in.middle.menu = Please select at least one item in middle menu
 please.confirm.you.want.to.detach.an.iso.from.the.virtual.machine = Please confirm you want to detach an ISO from the virtual machine
 please.specify.the.iso.you.wish.to.attach.to.virtual.machine = Please specify the ISO you wish to attach to virtual instance
 please.specify.the.new.name.you.want.to.change.for.the.virtual.machine = Please specify the new name you want to change for the virtual instance
diff --git a/ui/new/index.jsp b/ui/new/index.jsp
index 5303377df36..fe8dc8bfcd4 100644
--- a/ui/new/index.jsp
+++ b/ui/new/index.jsp
@@ -554,7 +554,7 @@ long milliseconds = new Date().getTime();
         </div>
     </div>
    
-    <!-- Dialogs -->
+    <!-- Dialogs 1 -->
 	<div id="dialog_confirmation" title="Confirmation" style="display:none"></div>
 	<div id="dialog_info" title="Info" style="display:none"></div>
 	<div id="dialog_alert" title="Alert" style="display:none"></div>
@@ -577,6 +577,12 @@ long milliseconds = new Date().getTime();
 	     </p>
 	</div>
 	
+	<!-- Dialogs 2 -->
+	<div id="dialog_info_please_select_one_item_in_middle_menu" title="Info" style="display:none">
+	    <p>
+	        <%=t.t("please.select.at.least.one.item.in.middle.menu")%>
+	    </p>
+	</div>
 	
     <!-- templates starts here-->
     <div class="leftmenu_content" id="leftmenu_submenu_template" style="display: none">
diff --git a/ui/new/scripts/cloud.core2.init.js b/ui/new/scripts/cloud.core2.init.js
index cf3274af427..44d9400a188 100644
--- a/ui/new/scripts/cloud.core2.init.js
+++ b/ui/new/scripts/cloud.core2.init.js
@@ -405,7 +405,15 @@ $(document).ready(function() {
 	});
 	$("#dialog_session_expired").siblings(".ui-widget-header").css("background", "url('/client/css/images/ui-bg_errorglass_30_ffffff_1x400.png') repeat-x scroll 50% 50% #393939");
 	$("#dialog_session_expired").siblings(".ui-dialog-buttonpane").find(".ui-state-default").css("background", "url('/client/css/images/ui-bg_errorglass_30_ffffff_1x400.png') repeat-x scroll 50% 50% #393939");
+			
+	$("#dialog_info_please_select_one_item_in_middle_menu").dialog({ 
+		autoOpen: false,
+		modal: true,
+		zIndex: 2000,
+		buttons: { "OK": function() { $(this).dialog("close"); } }
+	});
 	
+	/*
 	$("#dialog_server_error").dialog({ 
 		autoOpen: false,
 		modal: true,
@@ -414,6 +422,7 @@ $(document).ready(function() {
 	});
 	$("#dialog_server_error").siblings(".ui-widget-header").css("background", "url('/client/css/images/ui-bg_errorglass_30_ffffff_1x400.png') repeat-x scroll 50% 50% #393939");
 	$("#dialog_server_error").siblings(".ui-dialog-buttonpane").find(".ui-state-default").css("background", "url('/client/css/images/ui-bg_errorglass_30_ffffff_1x400.png') repeat-x scroll 50% 50% #393939");
+	*/
 	
 	// Menu Tabs
 	$("#global_nav").bind("click", function(event) {
diff --git a/ui/new/scripts/cloud.core2.instance.js b/ui/new/scripts/cloud.core2.instance.js
index 4d7b8f47306..e8886bae5b8 100644
--- a/ui/new/scripts/cloud.core2.instance.js
+++ b/ui/new/scripts/cloud.core2.instance.js
@@ -42,7 +42,7 @@ function clickInstanceGroupHeader($arrowIcon) {
        	initDialog("dialog_attach_iso");  
         initDialog("dialog_change_name"); 
         initDialog("dialog_change_group"); 
-        initDialog("dialog_change_service_offering"); 
+        initDialog("dialog_change_service_offering", 600); 
         initDialog("dialog_confirmation_change_root_password");
         initDialog("dialog_confirmation_enable_ha");  
         initDialog("dialog_confirmation_disable_ha");            
@@ -732,6 +732,11 @@ var vmActionMap = {
         isAsyncJob: false,            
         dialogBeforeActionFn : doChangeName,
         afterActionSeccessFn: vmToMidmenu
+    },    
+    "Change Group": {
+        isAsyncJob: false,            
+        dialogBeforeActionFn : doChangeGroup,
+        afterActionSeccessFn: vmToMidmenu
     },
     "Change Service": {
         isAsyncJob: true,
@@ -739,11 +744,6 @@ var vmActionMap = {
         dialogBeforeActionFn : doChangeService,
         afterActionSeccessFn: vmToMidmenu
     },
-    "Change Group": {
-        isAsyncJob: false,            
-        dialogBeforeActionFn : doChangeGroup,
-        afterActionSeccessFn: vmToMidmenu
-    },
     "Enable HA": {
         isAsyncJob: false,            
         dialogBeforeActionFn : doEnableHA,
@@ -921,10 +921,31 @@ function doChangeName($t, selectedItemsInMidMenu, vmListAPIMap) {
 	}).dialog("open");
 }
 
-function doChangeService($t, selectedItemsInMidMenu, vmListAPIMap) { 
-	$.ajax({
-	    //data: createURL("command=listServiceOfferings&VirtualMachineId="+vmId), //can not specifiy VirtualMachineId since we allow multiple-item-selection.
-	    data: createURL("command=listServiceOfferings"), //can not specifiy VirtualMachineId since we support multiple-item-selection.
+function doChangeService($t, selectedItemsInMidMenu, vmListAPIMap) {    
+    var itemCounts = 0;
+    for(var id in selectedItemsInMidMenu) {
+        itemCounts ++;
+    }
+   
+    var apiText;
+    if(itemCounts == 0) {
+        $("#dialog_info_please_select_one_item_in_middle_menu").dialog("open");		
+        return;
+    }
+    else if(itemCounts == 1){
+        var firstItemId;
+        for(var id in selectedItemsInMidMenu) {
+            firstItemId = id;
+            break;
+        }    
+        apiText = "command=listServiceOfferings&VirtualMachineId="+firstItemId;
+    }
+    else {
+        apiText = "command=listServiceOfferings";
+    }   
+
+	$.ajax({	   
+	    data: createURL(apiText), 
 		dataType: "json",
 		success: function(json) {
 			var offerings = json.listserviceofferingsresponse.serviceoffering;