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) {
		walls__ceilings_over = newImage("images/sub/walls--ceilings_over.gif");
		walls__lighting_over = newImage("images/sub/walls--lighting_over.gif");
		walls__doors___windows_over = newImage("images/sub/walls--doors-windows_over.gif");
		ceilings_walls__over = newImage("images/sub/ceilings-walls-_over.gif");
		ceilings_lighting_over = newImage("images/sub/ceilings-lighting_over.gif");
		ceilings_doors___windows_over = newImage("images/sub/ceilings-doors-windows_ov.gif");
		lighting_walls__over = newImage("images/sub/lighting-walls-_over.gif");
		lighting_ceilings_over = newImage("images/sub/lighting-ceilings_over.gif");
		lighting_doors___windows_over = newImage("images/sub/lighting-doors-windows_ov.gif");
		doors___windows_walls__over = newImage("images/sub/doors-windows-walls-_over.gif");
		doors___windows_ceilings_over = newImage("images/sub/doors-windows-ceilings_ov.gif");
		doors___windows_lighting_over = newImage("images/sub/doors-windows-lighting_ov.gif");
		preloadFlag = true;
	}
}