function emailCheck (emailStr) {
	if (emailStr==null||emailStr=="") {
		alert("Please enter an e-mail address.");
		return false;
	}
	emailStr = emailStr.toLowerCase();
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;\\'+:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) {
		alert("Your e-mail address seems incorrect (check @ and .'s)");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("Ths e-mail username contains invalid characters.");
			return false;
		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			return false;
		}
	}
	if (user.match(userPat)==null) {
		alert("The e-mail username doesn't seem to be valid.");
		return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
				return false;
			}
		}
		return true;
	}
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			alert("The domain name does not seem to be valid.");
			return false;
		}
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("Please check the last part of your e-mail address.\n\nThe address must end in a well known domain or two letter country.");
		return false;
	}
	if (len<2) {
		alert("This address is missing a hostname!");
		return false;
	}
	return true;
}
function ckSFld(x,i,message){
	if(document.forms[x].elements[i].selectedIndex==0){
		alert('Please select from ' + message + '.');
		return false;
	}
	else return true;
}
function ckFld(x,i,message){
	if(document.forms[x].elements[i].value==''){
		alert(message + ' is required.');
		return false;
	}
	else return true;
}
function cfEmailValid(x){
	if (document.forms[x].email.value != document.forms[x].email2.value){
		alert("Please re-type your email address to confirm it is spelled correctly.");
		return false;
	} 
	else return true;
}

function ckF(){
	var fname="contact_form";
	if (ckSFld(fname,'brand_select','Brand') && ckSFld(fname,'location_select','Location') && ckSFld(fname,'subject_select','Subject') && ckFld(fname,'yourname','Your Name')) {
		if (emailCheck(document.forms[fname].email.value) && cfEmailValid(fname)) return true;
		else return false;
	}
	else return false;
}