var TIMEOUTPRELOAD;
  var TIMEOUTPRELOADDELAY = 30;

  function unfadePage(diff) {
    if (TIMEOUTPRELOAD){
      window.clearTimeout(TIMEOUTPRELOAD);
    }
    var preloadPage = document.getElementById('opacity-elem');
    if (!preloadPage){
      return;
    }
    var opGrenzwert = 0;
    var opValue = parseFloat(diff);
    diff -= 0.02;
    if (preloadPage.filters != undefined){
      // IE
      ieDiff = parseFloat(diff * 100);
      var opValue = ieDiff;
      preloadPage.filters['Alpha']['opacity'] = opValue;
      preloadPage.filters['Alpha']['finishopacity'] = opValue;
    } else {
      preloadPage.style.opacity = opValue;
    }
    if (opValue > opGrenzwert) {
      var func = function () {unfadePage(diff)};
      TIMEOUTPRELOAD = window.setTimeout(func, TIMEOUTPRELOADDELAY);
      return;
    }
    preloadPage.style.display = 'none';
  }