function emailCheck(emailStr)

{

	emailStr = emailStr.toLowerCase();

	var checkTLD=1;

	var knownDomsPat=/^(com|net|org|biz|edu|int|mil|gov|arpa|aero|name|coop|info|pro|museum|tv|ca|se|fr|de|it|jp|ng|no)$/;

	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)

	{

			return false;

	}

	var user=matchArray[1];

	var domain=matchArray[2];



	for (i=0; i<user.length; i++)

	{

		if (user.charCodeAt(i)>127)

		{

			return false;

		}

	}



	for (i=0; i<domain.length; i++)

	{

		if (domain.charCodeAt(i)>127)

		{

			return false;

		}

	}



	if (user.match(userPat)==null)

	{

        	return false;

	}



	var IPArray=domain.match(ipDomainPat);

	if (IPArray!=null)

	{

		for (var i=1;i<=4;i++)

		{

			if (IPArray[i]>255)

			{

				return false;

			}

		}

	}



	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)

		{

			return false;

		}

	}



	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1)

	{

		return false;

	}



	if (len<2)

	{

		return false;

	}

	return true;

}