var preloadFlag = false;

function newImage(arg) {
	if (document.images) {
		var rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
	return false;
}

function changeImages(uno, dos) {
	if (document.images && (preloadFlag == true)) {
		document[uno].src = dos;
	}
	return preloadFlag;
}

function preloadImages() {
	if (document.images) {
		var home_page_o = newImage("/img/nav_bar/home_page_o.gif");
		var about_tlhs_o = newImage("/img/nav_bar/about_tlhs_o.gif");
		var who_we_are_o = newImage("/img/nav_bar/who_we_are_o.gif");
		var ad_o = newImage("/img/nav_bar/assessment_day_o.gif");
		var join_o = newImage("/img/nav_bar/join_o.gif");
		var links_o = newImage("/img/nav_bar/links_o.gif");
		preloadFlag = true;
	}
	return preloadFlag;
}