function validate(){
    if("" == document.contact_form.testimonial.value) {
      alert("Please provide us with your testimonial");
      return false;
    }
    
    if("" == document.contact_form.first_name.value) {
      alert("Please provide us with your first name");
      return false;
    }
    
    if("" == document.contact_form.last_name.value) {
      alert("Please provide us with your last name");
      return false;
    }
    
    if("" == document.contact_form.email_address.value) {
      alert("Please provide us with your email address");
      return false;
    }
    
    return true;
  }