var xPos2, yPos2;
var prm2 = Sys.WebForms.PageRequestManager.getInstance();
prm2.add_beginRequest(BeginRequestHandler);
prm2.add_endRequest(EndRequestHandler);


function BeginRequestHandler(sender, args) {
    xPos2 = $get('ctl00_ContentPlaceHolder1_Panel2').scrollLeft;
    yPos2 = $get('ctl00_ContentPlaceHolder1_Panel2').scrollTop;
}
function EndRequestHandler(sender, args) {
    $get('ctl00_ContentPlaceHolder1_Panel2').scrollLeft = xPos2;
    $get('ctl00_ContentPlaceHolder1_Panel2').scrollTop = yPos2;

}