function validateEmail(email, msg, optional) {
	if (!email.value && optional) {
		return true;
	}

	var re_mail = /^[\w\.\-]+\x40[\w\.\-]+\.\w{2,6}$/;
	if (!re_mail.test(email.value)) {
		alert(msg);
		email.focus();
		email.select();
		return false;
	}

	return true;
}

function categorySubmit(categoryvalue) {
	category = categoryvalue.options[categoryvalue.selectedIndex].value;

	if (category != '') {
		newpage = category;
		window.location.href = newpage;
	}
}

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) {
		home_over = newImage("index_files/home_over.gif");
		home_down = newImage("index_files/home_down.gif");
		shows_over = newImage("index_files/shows_over.gif");
		shows_down = newImage("index_files/shows_down.gif");
		photos_over = newImage("index_files/photos_over.gif");
		photos_down = newImage("index_files/photos_down.gif");
		location_over = newImage("index_files/location_over.gif");
		location_down = newImage("index_files/location_down.gif");
		faq_over = newImage("index_files/faq_over.gif");
		faq_down = newImage("index_files/faq_down.gif");
		contact_over = newImage("index_files/contact_over.gif");
		contact_down = newImage("index_files/contact_down.gif");
		mailinglist_over = newImage("index_files/mailinglist_over.gif");
		mailinglist_down = newImage("index_files/mailinglist_down.gif");
		booking_over = newImage("index_files/booking_over.gif");
		booking_down = newImage("index_files/booking_down.gif");
		food_over = newImage("index_files/food_over.gif");
		food_down = newImage("index_files/food_down.gif");
		preloadFlag = true;
	}
}