function checkValues() {
    if (document.frmContact.visitor.value == "") {
      alert("Please enter a value for 'Your name' before submitting your question or comments.");
      document.frmContact.visitor.focus();
      return; }
    if (document.frmContact.visitormail.value == "") {
      alert("Please enter a value for 'Your e-mail address' before submitting your question or comments.");
      document.frmContact.visitormail.focus();
      return; }
    document.frmContact.submit(); }