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 part of your email address before the '@' 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("Part of your email address after the '@' 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].length<2 || 
		domArr[domArr.length-1].length>6) {
	   /*alert("The address must end in a top level domain (e.g. .com), or two letter country.");*/
	   return false;
	}
	if (len<2) {
	   var errStr="This address is missing a hostname!";
	   /*alert(errStr);*/
	   return false;
	}
	return true;
}