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) {
					  alert('Thank you for signing up!');
						} else {
							alert('Thank you for signing up!');
						}
				  return false;
				 }
				 else
				 {
				  return true;
				 }
				}