Following is the jquery default function that is run. we can use this to get the ajaxrequests
function pageLoad() {
if (!Sys.WebForms.PageRequestManager.getInstance().get_isInAsyncPostBack()) {
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(AjaxBegin);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(AjaxEnd);
}
}