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

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

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		home_over = newImage("images/home_over.gif");
		current_over = newImage("images/current_over.gif");
		guest_over = newImage("images/guest_over.gif");
		previous_over = newImage("images/previous_over.gif");
		solutions_over = newImage("images/solutions_over.gif");
		clue_guide_over = newImage("images/clue_guide_over.gif");
		links_over = newImage("images/links_over.gif");
		preloadFlag = true;
	}
}