dead-simple client-side mail validation for form fields

gistfile1.js

function validateEmail($email){
 var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
 if(!emailReg.test($email)){
  return false;
 } else {
  return true;
 }
}

$(function(){
 $('.fail').hide();
 $(".submit").click(function(){
  var email = $("#email").val();
  if ( !validateEmail(email)){
   $('.fail').append("Algo anda mal!");
   $('.fail').show();
   $("#email").focus();
   return false;
  }