Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);


function BeginRequestHandler() {
    var up = document.getElementById("update_Progress_Container");
    up.style.height = $(window).height().toString() + "px";
    up.style.display = "block";
}
function EndRequestHandler() {
    var up = document.getElementById("update_Progress_Container");
    up.style.display = "none";
}