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) {
		online_booking_over = newImage("images/online_booking-over.jpg");
		gift_vouchers_over = newImage("images/gift-vouchers-over.jpg");
		locations_over = newImage("images/locations-over.jpg");
		contact_us_over = newImage("images/contact-us-over.jpg");
		careers_over = newImage("images/careers-over.jpg");
		home_over = newImage("images/home-over.jpg");
		price_list_over = newImage("images/price_list-over.jpg");
		treatments_over = newImage("images/treatments-over.jpg");
		preloadFlag = true;
	}
}

function validate_required(field,alerttxt) {
	with (field) {
		if (value==null||value=="") {
			alert(alerttxt);
			return false;
		} else {
			return true;
		}
	}
}

function validate_form(thisform) {
	with (thisform) {
		if (validate_required(phone,"Please fill out your contact phone number!")==false) {
			phone.focus();
			return false;
		}
	}
}