function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages(x,y) {
	if (document.images && (preloadFlag == true)) {
		document.getElementById(x).src = y;
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		map = newImage("images/map.gif");
		preloadFlag = true;
	}
}