function CheckMail()
{
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9])+$/;
	if(filter.test(document.forms[1].email.value))
		return true;
	alert("Please enter a valid email address.");
	return false;
}

		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("Email address seems incorrect (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 known domain or two letter " + "country.");
					return false;
				}

			if (len<2) {alert("This address is missing a hostname!");return false;}
			return true;
		}