Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequestHandler);

function endRequestHandler(sender, args) {
  //--check to see if the sender should cause the "Saved" message to display
    //--use JQuery Fadeout effect to make the "Saved Message" display on the screen
    //  temporarily
}

//--Get an instance of the PageRequestManager so we can
//  designate an end-request handler
var prm = Sys.WebForms.PageRequestManager.getInstance();
//--designed the displayFadeoutMessage as the end request handler
prm.add_endRequest(displayFadeoutMessage);

function displayFadeoutMessage() {
    //--if there is a message to display then show it
    if ($("#ctl00_hfSaveMessageText").attr("value") != "") {
        //--add a span to the placeholder span and then fade it out
        //  over 4.5 seconds
        $("#mpSaveSpot").append("<span id='spanFadeoutMessage' style='background-color:#ddd;'>" + $("#ctl00_hfSaveMessageText").attr("value") + "</span>").fadeOut(4500, function() {
                //--once the message is faded out then clear the message hidden
                //  field and clear out the message span
                $("#ctl00_hfSaveMessageText").attr("value", "");
                $("#mpSaveSpot").empty();
        });
    }
}