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");
		about_over = newImage("images/about-over.gif");
		loss_over = newImage("images/loss-over.gif");
		infra_over = newImage("images/infra-over.gif");
		eff_over = newImage("images/eff-over.gif");
		prd_over = newImage("images/prd-over.gif");
		rprts_over = newImage("images/rprts-over.gif");
		prdcts_over = newImage("images/prdcts-over.gif");
		preloadFlag = true;
	}
}