Saludos
Código HTML:
<? echo $lista; ?> <form action="prueba_lista.php?valor=1" method="post"> <p> <select name="lista[]" size="5" multiple id="lista"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> </select> </p> <p> <input type="submit" name="Submit" value="Submit"> </p> </form>