function checkEmailAddress(emailAddress)
{ 
	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=emailAddress.match(emailPat);
	if (matchArray==null)
	{
		alert("Your email address is missing or incorrect.");
		return false;
	}

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

	for (i=0; i<user.length; i++)
	{
		if (user.charCodeAt(i)>127) 
		{
			alert("Please enter a valid email address.");
			return false;
		}
	}

	for (i=0; i<domain.length; i++)
	{
		if (domain.charCodeAt(i)>127) 
		{
   alert("Your email address is missing or incorrect.");
			return false;
		}
	}

	if (user.match(userPat)==null) 
	{
  alert("Your email address is missing or incorrect.");
		return false;
	}

	var IPArray=domain.match(ipDomainPat);

	if (IPArray!=null)
	{
		for (var i=1;i<=4;i++) 
		{
			if (IPArray[i]>255) 
			{
    alert("Your email address is missing or incorrect.");
				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("Your email address is missing or incorrect.");
			return false;
		}
	}

	if 
	(
		checkTLD && domArr[domArr.length-1].length!=2 && 
		domArr[domArr.length-1].search(knownDomsPat)==-1
	)
	{
  alert("Your email address is missing or incorrect.");
		return false;
	}


	if (len<2)
	{
  alert("Your email address is missing or incorrect.");
		return false;
	}

	return true;
}