If you scroll down the page and click on the triangle to hide that category, in addition to hiding the category the page jumps back to the top (scrolls back up). In Firefox anyway. This is because of the "#" target. There is a simple fix.
The cfrm.tpl template file needs to be changed from
<a href="#" onclick="showHideBlock('cat{$catrow[cats].CatId}');">to
<a href="#" onclick="showHideBlock('cat{$catrow[cats].CatId}');return false;">
