function validate()
{
  if(document.myform.first.value == "")
  {
    alert('Please enter your first name.');
    return false;
  }

  if(document.myform.last.value == "")
  {
    alert('Please enter your last name.');
    return false;
  }
  
  if(document.myform.email.value == "")
  {
    alert('Please enter your email address.');
    return false;
  }
  
  if(document.myform.phone.value == "")
  {
    alert('Please enter your voice phone number.');
    return false;
  }
  
  if(document.myform.comments.value == "")
  {
    alert('Please enter your question or comments.');
    return false;
  }

  return true;
}