function swapImage(imgName, fileName) {
	if(document.images) {
	var imgToChange="document." + imgName;
	imgToChange=eval(imgToChange);
	imgToChange.src=fileName;
	}
}

function preLoad() {
	if(document.images) {
		if(!document.imageArray) {
			document.imageArray=new Array();
			var i = document.imageArray.length;
			var a = preLoad.arguments;
			for(i=0; i<a.length; i++) {
				document.imageArray[i] = new Image; 
				document.imageArray[i].src=a[i];
			}
		}
	}
}