<script language="Javascript">
<!--
function chk(){
var tid = document.getElementById("num");
var ctg_1 = document.getElementById("ctg_1");
if (tid.checked==true) {
ctg_1.style.display = "block";
} else {
ctg_1.style.display = "none";
}
}
//-->
</script>
<td align="center">
<input type=checkbox id="num" name="num" onClick="javascript:chk();">
<div id="ctg_1" style='display:none'>
<table>
..
</table>
</div>
</td>