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_home_on = newImage("/images/navigation/nav_home_on.gif");
		nav_who_we_are_on = newImage("/images/navigation/nav_who_we_are_on.gif");
		nav_where_we_go_on = newImage("/images/navigation/nav_where_we_go_on.gif");
		nav_what_we_do_on = newImage("/images/navigation/nav_what_we_do_on.gif");
		nav_brochure_on = newImage("/images/navigation/nav_brochure_on.gif");
		nav_questions_on = newImage("/images/navigation/nav_questions_on.gif");
		nav_contact_on = newImage("/images/navigation/nav_contact_on.gif");
		preloadFlag = true;
	}
}