function preloadImages(){
	if (!document.getElementById) return;
				var imgOriginSrc;
				var imgTemp = new Array();
				var imgarr = document.getElementsByTagName('img');
				for (var i = 0; i < imgarr.length; i++)
				{
					if (imgarr[i].getAttribute('osrc'))
					{
						imgTemp[i] = new Image();
						imgTemp[i].src = imgarr[i].getAttribute('osrc');
						imgarr[i].onmouseover = function()
						{
							this.imgOriginSrc = this.getAttribute('src');
							this.setAttribute('src',this.getAttribute('osrc'))
						}
						imgarr[i].onmouseout = function()
						{
							this.setAttribute('src',this.imgOriginSrc)
						}
					}
				}
}