function verifyNewsletter(form){
  if(form.email.value == ""){
    alert("Please enter your e-mail address.");
    return false;
  }
}

function verifyFeedback(form){
  if(form.comments.value == ""){
    alert("Please enter your comments.");
    return false;
  } else if(form.name.value == ""){
    alert("Please enter your name.");
    return false;
  } else if(form.email.value == ""){
    alert("Please enter your e-mail address.");
    return false;
  } else return true;
}