JSP + bean + modification des couleurs d'un tableau

Hello !

Un petit exemple :
Code:
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<html>
<head>
<style type="text/css">
    <!--
    .normal {color: black}
    .error {color: red}
    -->
</style>
<script type="text/javascript">
function validate(colidx)
{
  for (var i=0; i<2; i++) {
      var idvalue = document.getElementById("value_"+colidx+"_"+i);
      var val = idvalue.value;
      if (isNaN(val))
          idvalue.className="error";
      else
          idvalue.className="normal";
  }
}
</script>
<body>
<form>
<table>
<tr>
   <th>Age</th>
<tr>
    <td><input id="value_0_0" class="normal" value="12"/></td>
</tr>
<tr>
    <td><input id="value_0_1" class="normal" value="12"/></td>
</tr>
</table>
<input type="button" value="GO" onclick="validate(0)"/>
</form>
</body>
</html>