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