function addLoadEvent(func) 
    {
      var oldonload = window.onload;
      if (typeof window.onload != 'function') 
      {
        window.onload = func;
      } 
      else
      {
        window.onload = function()
        {
          if (oldonload) 
          {
            oldonload();
          }
          func();
        }
      }
    }

    function setInnerBGHeight()
    {
        var InnerBG = document.getElementById('InnerBG');
        InnerBG.style.bottom = '0px';    
    }

    function setGalleryNavBGHeight()
    {
        var GalleryNavBg = document.getElementById('GalleryNavBg');
        GalleryNavBg.style.bottom = '0px';    
    }

    function SetMainContentTopMargin()
    {
        var topMargin = 0;
        var topNav = document.getElementById('MainNavigation');
        var ULs = topNav.getElementsByTagName('ul');
        for(var i = 0;i<ULs.length;i++)
        {
            var tmp = ULs[i];
            topMargin += tmp.offsetHeight;
        }
        if(ULs.length != 0)
        {
            document.getElementById('MainContent').style.marginTop = topMargin +'px';
        }
    }