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;	

}