On the following example, progress bar(UpdateProgress1) is displayed on the position of the button which got clicked
function pageLoad()
{
var manager = Sys.WebForms.PageRequestManager.getInstance();
manager.add_beginRequest(OnBeginRequest);
}
function OnBeginRequest(sender, args)
{
var postBackElement = args.get_postBackElement();
var position = $(“#”+postBackElement.id).offset();
$(“#<%=UpdateProgress1.ClientID%>”).css({‘position’ : ‘absolute’, ‘z-index’ : ’1002′, ‘overflow’ : ‘auto’,'top’ : position.top,’left’ : position.left}).fadeIn(100);
}