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) {
		but_home_over = newImage("images/but-home-over.jpg");
		but_custom_over = newImage("images/but-custom-over.jpg");
		but_standard_over = newImage("images/but-standard-over.jpg");
		but_design_over = newImage("images/but-design-over.jpg");
		but_stern_over = newImage("images/but-stern-over.jpg");
		but_bearings_over = newImage("images/but-bearings-over.jpg");
		but_repairs_over = newImage("images/but-repairs-over.jpg");
		but_contact_over = newImage("images/but-contact-over.jpg");
		but_quote_over = newImage("images/but-quote-over.jpg");
		preloadFlag = true;
	}
}