Show/Hide Tables

I am trying to show a table in the same spot as an existing table. I have the show hide thing working i just cant seem to get it to go over the table where i want it.

here is what i am using:

<script lang="JavaScript">
<!--
function toggleDisplay(definition)
{
if (definition.style.display == 'none')
{
definition.style.display=''
}
else
{
definition.style.display='none'
}
}

//-->
</script>

Then i am calling it like this:

<SPAN id="spandefinitionID9" onmouseover="this.style.cursor='hand'" onmouseout="this.style.cursor=''" class="headTd" onclick="toggleDisplay(definitionID9)">Link</span>

any ideas?

Thanks