fra hidden til visible

Nedenstående virker ikke, hvad er problemet?

<TR>
    <TD width="194"><DIV id="1"><a href="#" onClick="document.getElementById('second').style='visibility:visible;';document.getElementById('res2').style='visibility:visible;'">2nd map:</a></DIV></TD>
    <TD width="194"><INPUT id="second" type="text" name="second" style="visibility:hidden;">
    <SELECT name="res2" style="visibility:hidden;" id="res2">
    <OPTION value="3">Won</OPTION>
    <OPTION value="4">Lost</OPTION>
    <OPTION value="5">Draw</OPTION>
    <OPTION value="1">None</OPTION>
    </SELECT>
    </TD>
</TR>