function Show() { 
   jQuery("#DetailsPopup").css('z-index', 9990); 
   jQuery("#DetailsPopup").fadeIn('slow'); 
}

jQuery(document).ready(function (){
   //Hide popup 
   jQuery("#DetailsPopup").hide();
      
   Initialize();
   //code to fix jQuery after ajax callback...
   var scriptManager = Sys.WebForms.PageRequestManager.getInstance();
   if (scriptManager) {
        scriptManager.add_endRequest(Initialize);
   }
   
  
   
});

function Initialize() {
    //Close Popup
    jQuery("#btnClose").click(function (){ 
        jQuery("#DetailsPopup").fadeOut('slow'); 
    });
}