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) {
		btn_nav_home_over = newImage("images/btn_nav_home-over.gif");
		btn_nav_whatis_over = newImage("images/btn_nav_whatis-over.gif");
		btn_nav_convening_over = newImage("images/btn_nav_convening-over.gif");
		btn_nav_resources_over = newImage("images/btn_nav_resources-over.gif");
		btn_nav_contact_over = newImage("images/btn_nav_contact-over.gif");
		btn_nav_news_over = newImage("images/btn_nav_news-over.gif");
		btn_nav_login_over = newImage("images/btn_nav_login-over.gif");
		vid_display_lo_over = newImage("images/vid_display-lo_over.gif");
		vid_display_hi_over = newImage("images/vid_display-hi_over.gif");
		btn_vid_lo_over = newImage("images/btn_vid-lo-over.gif");
		btn_vid_hi_over = newImage("images/btn_vid-hi-over.gif");
		preloadFlag = true;
	}
}