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) {
			document.images[imageName].src = fileName;
		}
	}