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) {
		nav_education = newImage("images/nav_education-over.gif");
		nav_safety = newImage("images/nav_safety-over.gif");
		nav_benefits = newImage("images/nav_benefits-over.gif");
		nav_info = newImage("images/nav_info-over.gif");
		nav_products = newImage("images/nav_products-over.gif");
		nav_faq = newImage("images/nav_faq-over.gif");
		nav_promotions = newImage("images/nav_promotions-over.gif");
		preloadFlag = true;
	}
}