CheckBoxList是后台代码手动绑定的，前台页面怎么做全选啊？

 <td>

<input id="chkFestival_4" type="checkbox" name="chkFestival$4" />

<label for="chkFestival_4">妇女节</label>

<input id="chkFestival_5" type="checkbox" name="chkFestival$5" />

<label for="chkFestival_5">愚人节</label>

<input id="chkFestival_6" type="checkbox" name="chkFestival$6" />

<label for="chkFestival_6">劳动节</label>

</td>