<!--//
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);
var message = '';

if (matchArray==null) {
	message = message + "<P>Email address seems incorrect (check @ and . )";
	return message;
}

	var user=matchArray[1];
	var domain=matchArray[2];

for (i=0; i<user.length; i++) {
	if (user.charCodeAt(i)>127) {
	message = message + "<P>Email contains invalid characters";
	return message;
   }
}

for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
	message = message + "<P>Email domain name contains invalid characters";
	return message;
   }
}

if (user.match(userPat)==null) {
	message = message + "<P>Email doesn't seem to be valid";
	return message;
}

var IPArray=domain.match(ipDomainPat);

if (IPArray!=null) {
	for (var i=1;i<=4;i++) {

if (IPArray[i]>255) {
	message = message + "<P>Destination IP address is invalid";
	return message;
   }
}
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) {
		message = message + "<P>Email domain name does not seem to be valid";
	return message;
	}
}

if (checkTLD && domArr[domArr.length-1].length!=2 &&
domArr[domArr.length-1].search(knownDomsPat)==-1) {
message = message + "<P>Email must end in a well-known domain or two letter country";
return message;
}

if (len<2) {
	message = message + "<P>Email is missing a hostname";
	return message;
}

	return message;

}
//-->
