function validateForm() {
   var ok = true;
   var df = document.contactform;
   if (df.NAME.value=="") {
      ok = false
      alert("Please enter your name.")
      df.NAME.focus()
   }
   if (ok && df.EMAIL.value=="") {
      ok = false
      alert("Please enter an e-mail address.")
      df.EMAIL.focus()
   }
   if (ok && df.PHONE.value=="") {
      ok = false
      alert("Please enter your phone number.")
      df.PHONE.focus()
   }
   if (ok) {
      df.submit("process.php")
   }
}