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<script type="text/javascript">
  function formular_pruefen() {
    f = document.formular;
    t = f.t.value;
    m = f.m.value;
    j = f.j.value;
    result = true;
    text = '';
    if (t == '' || m == '' || j == '') {
      result = false;
      text += '- Datum fehlt!\n';
    }
    else {
      tmj = t + '.' + m + '.' + j;
      dateform = /\d\d\.\d\d\.\d\d\d\d/;
      if(!tmj.match(dateform) {
        result = false;
        text += tmj + '- falsches Datumsformat!\n';
      }
      else {
        var heute = new Date();
        var datum = new Date(f.j.value,f.m.value,f.t.value);
        if(datum.getTime() > heute.getTime()) {
          result = false;
          text += '- Datum liegt in der Zukunft!\n';
        }
      }
    }
    if (f.start.value == '') {
      result = false;
      text += '- Start fehlt!\n';
    }
    if (result == false) {
      alert(text);
    }
    return result;
  }
</script>

<?PHP
    echo '<form action="'.$PHP_SELF.'" method="post" name="formular" onSubmit="return formular_pruefen()">';
    echo '<table class="trans"><tr>';
    echo '<td class="t_norm"><nobr><input type="Text" name="t" size="1" maxlength="2">.<input type="Text" name="m" size="1" maxlength="2">.<input type="Text" name="j" size="2" maxlength="4"></td>';
    echo '</tr><tr>';
    echo '<td class="t_norm"><input type="Text" name="start" maxlength="11"></td>';
    echo '</tr><tr>';
    echo '<td class="t_norm"><center><input class="input" type="submit" value="Submit"></center></td>';
    echo '</tr></table>';
    echo '</form>';
?>