<!--
function required(){
var message = '';

var theEmail = document.contactus.email.value;
	var atLoc = theEmail.indexOf("@",1);
	var dotLoc = theEmail.indexOf(".",atLoc+2);
	var len = theEmail.length;
	if (!(atLoc > 0 && dotLoc > 0 && len > dotLoc+2)){
	message = "The email you entered is not valid\n";}
	if (!document.contactus.email.value){
		message = "You must enter a valid e-mail address\n";}

if (!document.contactus.telephone.value && !document.contactus.mobile.value){
	message = message + "You must enter a telephone or mobile number";}
	
if (message != ''){
	alert(message);}
}
//-->