Expand/Collapse button not working for rows

[reddyink]

I have put expand/collapse code for table by following direction from vbulletin manual.

Code is working for only first row title link. when I click on second row link same first row is collapsing and expanding. Can anybody please help me on how to write code for expand/collapse for each individual row. I also want first row to be expanded by default and all other rows user can click on it to expand/collapse. Here is my code i wrote working for only first row.
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<tr><td class="thead">
<a href="#top" style="float:$stylevar[right]"
onclick="return toggle_collapse('categ')"><img
id="collapseimg_categ"
src="$stylevar[imgdir_button]/collapse_tcat$vbcollapse[collapseimg_categ].gif"
alt="" border="0" /></a>
<a href="$cat[caturl]">$cat[title]</a></td></tr>
<tbody id="collapseobj_categ" style="$vbcollapse[collapseobj_categ]">
<tr><td>$cat[description]</td></tr>
</tbody>
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Please help me where am i missing to expand/collapse properly. I wasted 2 days already figuring out. If anybody can help me, I will really appreciate.
Thanks in advance