var orginalFormAction = null;
//capture the current form action value

function BeginRequestHandler() {  
orginalFormAction = theForm.action;}

//set the form action value back to the
//correct value

function EndRequestHandler() {  
theForm.action = orginalFormAction;  
theForm._initialAction = orginalFormAction;}

function RegisterRequestHandlers() {  
if (typeof (Sys) != "undefined") {    
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);    
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);    
Sys.Application.notifyScriptLoaded();  }}

//register request handlers after the application 
//has successfully loaded.

Sys.Application.add_load(RegisterRequestHandlers);