How do you make a collapsible box??

[Mostjolly]

I've successful managed to attached a collapsible image, but when clicking on it.. it disappears but the box remain the same/unchanged..

Here's the code I uses:

<a style="float:$stylevar[right]" href="#top" onclick="return toggle_collapse('referral')"><img id="collapseimg_referral" src="$stylevar[imgdir_button]/collapse_tcat$vbcollapse[collapseimg_my_table].gif" alt="" border="0" /></a>


Seems like img id is responsible for this.. or am I confused? Please provide me a working code so I can use

Thanks again,
Nhat