JS email validation (from btt's old contact-admin form)

<script type="text/javascript">
	function validate_contact_admin_form(form_id) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.forms[form_id].elements['email'].value;
   if(reg.test(address) == false) {
      alert('Invalid Email Address');
      return false;
   }
}
</script>