function emailCheck (emailStr) {

		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("Please include full e-mail address (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 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 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("The 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;
	
	}