realtime preview is working. but save to object when preview

app/controllers/admin/ad_banners_controller.rb

@@ -40,9 +40,9 @@ class Admin::AdBannersController < ApplicationController
   end
   
   def realtime_preview
-    @ad_banner = AdBanner.find(params[:id])    
+    @ad_banner = AdBanner.find(params[:id]).clone    
+    debugger
     @ad_banner.update_attributes(params[:ad_banner])
-    render  
   end
   
   def index