var ImgSrc = new Array();
var ImgItem = new Array();
var preloadFlag = false;

function preloadImages()	{
	for (i=0;i<ImgSrc.length;i++)	{
		if (ImgSrc[i])	{
			ImgItem[i] = new Image();
			ImgItem[i].src = ImgSrc[i];
			}
		}
	preloadFlag = true;
	}  


function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i< changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	} 
}