var prm = Sys.WebForms.PageRequestManager.getInstance();

//prm.add_initializeRequest(InitializeRequest);
//prm.add_endRequest(EndRequest);

Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(InitializeRequest);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequest);

// called when async postback occurs
function InitializeRequest(sender, args)
{
	$.AviaryAjaxShow();
}
function EndRequest(sender, args)
{
	$.AviaryAjaxHide();
}