Rainer: select jahr geht nicht

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Hallo, Tag und Monat funktionieren. Das Jahr nicht?
Kann wer einen Fehler sehen?

Gruß Rainer

<script type="text/javascript">
   function datum_setzen()
   {
  document.getElementById("bestellung_tag").selectedIndex = "09"
  document.getElementById("bestellung_monat").selectedIndex = "07"
  document.getElementById("bestellung_jahr").selectedIndex = "2012"
   }
</script>

und

<select size="1" name="bestellung_tag" id="bestellung_tag">
                  <option></option>
                 <option value="01" >01</option>
                 <option value="02" >02</option>
                 <option value="03" >03</option>
                 <option value="04" >04</option>
                 <option value="05" >05</option>
                 <option value="06" >06</option>
                 <option value="07" >07</option>
                 <option value="08" >08</option>
                 <option value="09" >09</option>
                 <option value="10" >10</option>
                 <option value="11" >11</option>
                 <option value="12" >12</option>
                 <option value="13" >13</option>
                 <option value="14" >14</option>
                 <option value="15" >15</option>
                 <option value="16" >16</option>
                 <option value="17" >17</option>
                 <option value="18" >18</option>
                 <option value="19" >19</option>
                 <option value="20" >20</option>
                 <option value="21" >21</option>
                 <option value="22" >22</option>
                 <option value="23" >23</option>
                 <option value="24" >24</option>
                 <option value="25" >25</option>
                 <option value="26" >26</option>
                 <option value="27" >27</option>
                 <option value="28" >28</option>
                 <option value="29" >29</option>
                 <option value="30" >30</option>
                 <option value="31" >31</option>
                    </select><b>.</b>
<select size="1" name="bestellung_monat" id="bestellung_monat">
                 <option></option>
                      <option value="01" >01</option>
                      <option value="02" >02</option>
                      <option value="03" >03</option>
                      <option value="04" >04</option>
                      <option value="05" >05</option>
                      <option value="06" >06</option>
                      <option value="07" >07</option>
                      <option value="08" >08</option>
                      <option value="09" >09</option>
                      <option value="10" >10</option>
                      <option value="11" >11</option>
                      <option value="12" >12</option>
                    </select><b>.</b>
<select size="1" name="bestellung_jahr" id="bestellung_jahr">
                 <option></option>
                      <option value="2003" >2003</option>
                      <option value="2004" >2004</option>
                      <option value="2005" >2005</option>
                      <option value="2006" >2006</option>
                      <option value="2007" >2007</option>
                      <option value="2008" >2008</option>
                      <option value="2009" >2009</option>
                      <option value="2010" >2010</option>
                      <option value="2011" >2011</option>
                      <option value="2012" >2012</option>
                    </select>

<input type="button" name="heute" value="Heute" onClick="datum_setzen();">