Actually, no, you would change the bottom part of the capture, which is this piece of code (I'm using the one from categories.tpl as an example):
Code:
{ include file="menu.tpl" dingbats="dingbats_categorie.gif" menu_title=$lng.lbl_categories menu_content=$smarty.capture.menu }
The top part stays the same no matter what, you just change the include part of the code I posted above.