function preload()
{
	document.pre=new Array();
    for(var i=0; i<document.images.length; i++)
   	{
  	  var j=document.pre.length;
      var img = document.images[i];
      var imgName = img.src;
	if (img.id=="preload")  {
			imagesPreloadName = new Array();
			var reg =new RegExp("on.","");
			if (imgName.lastIndexOf("on.")>-1) {
			imagesPreloadName[i] = imgName.substring(0,imgName.length-6)+imgName.substring(imgName.length-4,imgName.length);
			} else {
			imagesPreloadName[i] = imgName.substring(0,imgName.length-4)+"on."+imgName.substring(imgName.length-3,imgName.length);
			}
			document.pre[j] = new Image();
			document.pre[j++].src = imagesPreloadName[i];
      }
   }

}