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<form>
  <p>Ihre Pizza-Bestellung:</p>
  <label>Pizza
    <select name="Pizza" size="5" onchange="alert(this.value)">
      <option value="P101">Pizza Napoli</option>
      <option value="P102">Pizza Funghi</option>
      <option value="P103">Pizza Mare</option>
      <option value="P104">Pizza Tonno</option>
      <option value="P105">Pizza Mexicana</option>
      <option value="P106">Pizza Regina</option>
      <option value="P107">Pizza della Casa</option>
      <option value="P108">Pizza Calzone</option>
      <option value="P109">Pizza con tutto</option>
    </select>
  </label>
</form>