function centerUpdatePanel()
    {
     centerElementOnScreen(document.getElementById("usrPage_pnlAjax"));
    }

    function centerElementOnScreen(element)
    {
     var scrollTop = document.body.scrollTop;
     var scrollLeft = document.body.scrollLeft;

     var viewPortHeight = document.body.clientHeight;
     var viewPortWidth = document.body.clientWidth;

     if (document.compatMode == "CSS1Compat")
     {
      viewPortHeight = document.documentElement.clientHeight;
      viewPortWidth = document.documentElement.clientWidth;

      scrollTop = document.documentElement.scrollTop;
      scrollLeft = document.documentElement.scrollLeft;
     }

     var topOffset = Math.ceil(viewPortHeight/2 - element.offsetHeight/2);
     var leftOffset = Math.ceil(viewPortWidth/2 - element.offsetWidth/2);

     var top = scrollTop + topOffset - 50;
     var left = scrollLeft + leftOffset - 200;

     element.style.position = "absolute";
     element.style.top = top + "px";
     element.style.left = left + "px";
    }