function emailCheck (emailStr) {
	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("Email address seems incorrect (check @ and .'s)");
		 return false;
}
var user=matchArray[1];
var domain=matchArray[2];
if (user.match(userPat)==null) {
	 alert("The 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 domainArray=domain.match(domainPat);
if (domainArray==null) {
	 alert("The domain name doesn't seem to be valid.");
	 return false;
}
var atomPat=new RegExp(atom,"g");
var domArr=domain.match(atomPat);
var len=domArr.length;
if ((domArr[domArr.length-1] != "info") &&
	 (domArr[domArr.length-1] != "name") &&
	 (domArr[domArr.length-1] != "arpa") &&
	 (domArr[domArr.length-1] != "coop") &&
	 (domArr[domArr.length-1] != "aero")) {
		  if (domArr[domArr.length-1].length<2 ||
				domArr[domArr.length-1].length>3) {
					 alert("The address must end in a three-letter domain, or two letter country.");
					 return false;
		  }
}
if (len<2) {
	var errStr="This address is missing a hostname!";
	alert(errStr);
	return false;
}
return true;
}
function UPTvalidateform(thisform)
{
	
	if (emailCheck(thisform.email.value)) 
	{	

		  if (document.getElementById('unsubscribe') 
				&& !document.getElementById('unsubscribe').checked) {
			 
		  } else {
				
		  }
		return false;
	}
	else
	{
		return true;
	}
}

var firstTime = true;
function checkFirstSelection(){
if(firstTime)
	document.getElementById('email').value = '';
	firstTime=false;
}