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) {
		contents_home_over = newImage("images/contents_home-over.gif");
		contents_about_over = newImage("images/contents_about-over.gif");
		contents_warnings_over = newImage("images/contents_warnings-over.gif");
		contents_legal_over = newImage("images/contents_legal-over.gif");
		contents_market_over = newImage("images/contents_market-over.gif");
		contents_latest_over = newImage("images/contents_latest-over.gif");
		contents_additional_over = newImage("images/contents_additional-over.gif");
		contents_press_over = newImage("images/contents_press-over.gif");
		contents_clients_over = newImage("images/contents_clients-over.gif");
		contents_contact_over = newImage("images/contents_contact-over.gif");
		contents_employment_over = newImage("images/contents_employment-over.gif");
		preloadFlag = true;
	}
}