function formCheck(theForm){
  if (theForm.email.value == "") {
    alert("Please enter your email address.");
    theForm.email.focus();
    return (false);
  }

  if (theForm.fullname.value == "") {
    alert("Please enter your name.");
    theForm.fullname.focus();
    return (false);
  }

  if (theForm.comment.value == "") {
    alert("Please enter a comment.");
    theForm.comment.focus();
    return (false);
  }
  return (true);
}