function preLoad() {
		onImages = new Array();
		for (field in gPreLoadList) {
			onImages[field] = new Image();
			onImages[field].src = gPreLoadList[field];
		}
		gAction = "true";
	}
	function changeImage(imageName, fileName) {
		if (gAction == "true") {
			document.images[imageName].src = fileName;
		}
	}