function checkEmail(emailStr) {
            var s = emailStr;
            var filter=/.[^@]*@[\w]*[\w\.-][\w]*\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]/;
            if (s.length == 0 ) return false;
            if (filter.test(s))
            	return true;
            else
            	return false;       
}