function validator(form) { 

  if (form.name.value == "") {
    alert("Please provide us with your Name.");
    form.name.focus();
    return false;
  }
  if (form.email.value == "") {
    alert("Please provide us with your Email Address.");
    form.email.focus();
    return false;
  }
  if (form.comments.value == "") {
    alert("Please provide us with your Comments.");
    return false;
  } 
  if (form.spam.value != "b5ZmT8") {
    alert("The anti-spam letters/digits you have provided are incorrect.  Please try again.");
    return false;
  }   

return true; 
}