function initRollovers()
{
  if (!document.getElementById) return
	
  var aPreLoad = new Array();
  var sTempSrc;
  var aImages = document.getElementsByTagName('img');

  for (var i = 0; i < aImages.length; i++)
  {		
    if (aImages[i].className == 'imgover')
    {
      var src = aImages[i].getAttribute('src');
      var ftype = src.substring(src.lastIndexOf('.'), src.length);
      var hsrc = src.replace(ftype, '_hi'+ftype);

      aImages[i].setAttribute('hsrc', hsrc);
			
      aPreLoad[i] = new Image();
      aPreLoad[i].src = hsrc;
			
      aImages[i].onmouseover = function()
      {
        sTempSrc = this.getAttribute('src');
        this.setAttribute('src', this.getAttribute('hsrc'));
      }	
			
      aImages[i].onmouseout = function()
      {
        if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_hi'+ftype, ftype);
        this.setAttribute('src', sTempSrc);
      }
    }
  }
}

window.onload = initRollovers;