1<input id="cbxBirthDate" type="checkbox" onClick="javascript:uncheckShowYear(this);" />
2<input id="cbxShowYear" type="checkbox" />
3
4
5<script language="javascript" type="text/javascript">
6function uncheckShowYear(obj)
7        {
8            if (obj.checked == false)
9            {
10                document.getElementById("cbxShowYear").checked = false;
11            }
12        }
13</script>
14