page mask and file download

[fachhoch]

I am using page mask  java script function suggested by wicket wiki  site.
http://www.nabble.com/generalized-way-to-ignore-mouse-input-during-screen-refresh--td21379945.html#a21381260

here is the java script
        <script type="text/javascript">

  window.onload = setupFunc;

  var busySymbol;

  function setupFunc() {
    document.getElementsByTagName('body')[0].onclick = clickFunc;
    hideBusysign();
    Wicket.Ajax.registerPreCallHandler(showBusysign);
    Wicket.Ajax.registerPostCallHandler(hideBusysign);
    Wicket.Ajax.registerFailureHandler(hideBusysign);
  }

  function hideBusysign() {
    if (busySymbol != null) {
      busySymbol.parentNode.removeChild(busySymbol);
      busySymbol = null;
    }
  }

  function showBusysign() {
    if (!document.getElementById('busy-symbol')) {
      busySymbol = document.createElement('div');
      busySymbol.id = 'busy-symbol';

      var pageHeight;

      if ((window.innerHeight != null) && (window.scrollMaxY != null))
{ // Firefox
        pageHeight = window.innerHeight + window.scrollMaxY;
      } else if (document.body.scrollHeight >
document.body.offsetHeight) { // all but Explorer Mac
        pageHeight = document.body.scrollHeight;
      } else if (document.height != undefined) {
        pageHeight = document.height;
      } else { // works in Explorer 6 Strict, Mozilla (not FF) and Safari
        pageHeight = document.body.offsetHeight + document.body.offsetTop;
      }

      {
        var busyLabel  = document.createElement('div');
        busyLabel.innerHTML = 'Loading ...';
        busySymbol.appendChild(busyLabel);
      }

      document.body.appendChild(busySymbol);

      busySymbol.style.height = pageHeight + 'px';
    }
  }

  function clickFunc(eventData) {
    var clickedElement = (window.event) ? event.srcElement :
eventData.target;

    if ((clickedElement.tagName.toUpperCase() == 'A'
          && (clickedElement.href.lastIndexOf('#') !=
(clickedElement.href.length-1))
          && (clickedElement.href.indexOf('WicketAjaxDebug') < 0)
          && (clickedElement.href.lastIndexOf('.doc') !=
(clickedElement.href.length-4))
          && (clickedElement.href.lastIndexOf('.csv') !=
(clickedElement.href.length-4))
          && (clickedElement.href.lastIndexOf('.xls') !=
(clickedElement.href.length-4))
          && ((clickedElement.onclick == null) ||
(clickedElement.onclick.toString().indexOf('window.open') <= 0))
          )
      || (clickedElement.parentNode.tagName.toUpperCase() == 'A'
          && (clickedElement.parentNode.href.lastIndexOf('#') !=
(clickedElement.parentNode.href.length-1))
          && (clickedElement.parentNode.href.lastIndexOf('.doc') !=
(clickedElement.parentNode.href.length-4))
          && (clickedElement.parentNode.href.lastIndexOf('.csv') !=
(clickedElement.parentNode.href.length-4))
          && (clickedElement.parentNode.href.lastIndexOf('.xls') !=
(clickedElement.parentNode.href.length-4))
          && ((clickedElement.parentNode.onclick == null) ||
(clickedElement.parentNode.onclick.toString().indexOf('window.open')
<= 0))
          )
      || (
         ((clickedElement.onclick == null)
           || ((clickedElement.onclick.toString().indexOf('window') <= 0)
                && (clickedElement.onclick.toString().indexOf('confirm') <=
0)))
         && ((clickedElement.tagName.toUpperCase() == 'INPUT' ||
clickedElement.tagName.toUpperCase() == 'BUTTON')
             && (clickedElement.type.toUpperCase() == 'BUTTON'
                 || clickedElement.type.toUpperCase() == 'IMAGE'
                 || clickedElement.type.toUpperCase() == 'SUBMIT'))
         )
      ) {
      showBusysign();
    }
  }

</script>
this works  fine. Today  I implemented the wicket file download  , download
works fine but the script 
as usual loads the loading text, but never turns off
in ajax links it works fine but the file download it never stops please help
me resolve this. 
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