__dopostback is not working in javascript function

Question

am calling __dopostback function in javascript while closing event of browser but its not working in Chrome.

the same function is working in IE

can any one give me the solution.

<script type="text/javascript" language="javascript"> 
function doUnload() 
{ 
 var btnlogout = document.getElementById("ctl00_lbtn_Logout"); alert(btnlogout);   
 __doPostBack(btnlogout, ''); 
} 
</script>

Answer 1

When doing a __doPostBack, you need to pass the control's UniqueID via javascript. ClientID will not work.