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) {
                return "Email address is invalid";
                //return ;
        }

        var user=matchArray[1];
        var domain=matchArray[2];
        for (i=0; i<user.length; i++) {
                if (user.charCodeAt(i)>127) {
                        return "Email Address contains invalid characters.";
                        //return ;
                   }
        }
        for (i=0; i<domain.length; i++) {
                if (domain.charCodeAt(i)>127) {
                        return "The text entered in the email address following the @ contains invalid characters.";
	        //return "Ths domain name contains invalid characters.";
                        //return ;
                  }
        }
        if (user.match(userPat)==null) {
                return "Email Address is not valid.";
	//return "The username doesn't seem to be valid.";
                //return ;
        }
        var IPArray=domain.match(ipDomainPat);
        if (IPArray!=null) {
                for (var i=1;i<=4;i++) {
                        if (IPArray[i]>255) {
                                return "The text entered in the email address following the @ is either expired or not functional.";
		//return "Destination IP address is invalid!";
                                //return ;
                         }
                }
                return "Valid";
        }
        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 "The text entered in the email address following the @ is not a valid domain.";
                        //return ;
                 }
        }

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

        if (len<2) {
	 return "Email Address is invalid";
                 //return "This address is missing a hostname!";
                //return ;
        }
        return "Valid";
}