asp.net background execution method foreground js

         #region Ajax perform JS script
         ///  <the Summary> 
        /// Ajax perform JS script
         ///  </ the Summary> 
        ///  <param name = "Ctrl"> Controls call </ param> 
        ///  < param name = "script"> execution of the JS script </ param> 
        public  static  void AjaxScript (Ctrl Control, String script) 
        { 
            System.Web.UI.ScriptManager.RegisterStartupScript (Ctrl, ctrl.GetType (), "" , script, to true ); 
        } 
        #endregion 
 
 
 
Called: 
      AjaxScript ( the this .page,"tt();" )    //    tt () method is js foreground name; this.Page common template page with the page directly on ok Page