function validateForm(myform) {
  hasErrors=false;

  var myRe= new RegExp("^[a-zA-Z0-9_\+-]+(\.[a-zA-Z0-9_\+-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.([a-zA-Z]{2,4})$");
  if ( ! myRe.test(myform.email.value) ) {
    hasErrors = true;
  }
  if ( hasErrors ) {
     alert("Please enter a valid email address.");
     return false;
  } else {
     return true;

  }

}