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) {
		ln_home_over = newImage("images/ln_home-over.gif");
		ln_about_over = newImage("images/ln_about-over.gif");
		ln_air_over = newImage("images/ln_air-over.gif");
		ln_fireplace_over = newImage("images/ln_fireplace-over.jgifpg");
		ln_geo_over = newImage("images/ln_geo-over.gif");
		ln_heaters_over = newImage("images/ln_heaters-over.gif");
		ln_hvac_over = newImage("images/ln_hvac-over.gif");
		ln_services_over = newImage("images/ln_services-over.gif");
		preloadFlag = true;
	}
}