function emailCheck(emailStr) {
			var 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("Incorrect E-mail Address: check ampersands ('@') and periods ('.')");
			return false;
			}
			var user=matchArray[1];
			var domain=matchArray[2];
			
			
			for (i=0; i<user.length; i++) {
			if (user.charCodeAt(i)>127) {
			alert("Incorrect E-mail Address: E-mail Address does not appear to be valid.");
			return false;
			   }
			}
			for (i=0; i<domain.length; i++) {
			if (domain.charCodeAt(i)>127) {
			alert("Incorrect E-mail Address: contains invalid characters.");
			return false;
			   }
			}
			if (user.match(userPat)==null) {
			alert("Incorrect E-mail Address: E-mail Address does not appear 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("Incorrect E-mail Address: E-mail Address does not appear to be valid.");
			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("Incorrect E-mail Address: E-mail Address does not appear to be valid.");
			return false;
			   }
			}
			
			if (checkTLD && domArr[domArr.length-1].length!=2 && 
			domArr[domArr.length-1].search(knownDomsPat)==-1) {
			alert("Incorrect E-mail Address: E-mail Address must end in a well-known domain or two letter country.");
			return false;
			}
			
			if (len<2) {
			alert("Incorrect E-mail Address: E-mail Address does not appear to be valid.");
			return false;
			}
			return true;
			}
			
			
		var alertmsg = ""
		function checkLoginForm(form) {
			if (form.userName.value == "") {
				alertmsg = alertmsg + ("Incorrect information: please enter your Name. \n")
			}
			if (form.email.value == "") {
				alertmsg = alertmsg + ("Incorrect information: please enter your E-mail Address. \n")
			}
			if (alertmsg!="") {
				alert(alertmsg)
				alertmsg = ""
				return false
				} else {
				var emailStr = form.email.value
				return emailCheck(emailStr);
				}
			return true;
			}