Да совсем забыл указать
<script language=Javascript>
function hideshow(ids) {
ids.style.display = (ids.style.display == 'none') ? '' : 'none'
}
</script>
<table onclick=hideshow(named)><tr><td>zhmi sjuda</td></tr></table>
<table style="DISPLAY: none" ID=named><tr><td>privet</td></tr>
</table>