digulu - You would use your TM template foldername in place of "your_template".

/includes/languages/english/extra_definitions/TM_001/categories_dressing_defines.php
/includes/modules/sideboxes/TM_001/ch_categories.php

weber - If you have navigated to the product info page through categories/subcategories, Zen Cart by default will have a cPath in the URL. Some SEO mods may eliminate that and may not show how you got there, meaning that if the product is linked to two categories it is not possible to know the active category. A link to see your site will make it easier to advise on this problem.