function preLoad() {
	if (document.images) {
		var preimage = new Array();
		for (var i = 0; i < gPreimages.length; i++) {
			preimage[i] = new Image();
			preimage[i].src = gPreimages[i];
		}
		gPreloadflag = true;
	}
}

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