create osCommerce contrib

I would like to add dropdowns for categories and subcategories in osCommerce. The following contribution does what I would like except that it also includes manufacturer. DropDownMenu v2.0 (Advanced Search infobox) [login to view URL],2306/ Unfortunately I could not get it to work properly and anyway, I'm not sure how well it is coded. Refer to the attached image to see how I envision it. The following requirements apply, unless not they are feasible: 1) The feature should be completely consistent and compatible with stock osCommerce. 3) The layout should be easy to change from horizontal (dropdowns in a row) to vertical (stacked dropdowns). 3) The feature should be easy to expand to more subcategories or contract to fewer subcategories. 4) The feature should still function even if the user doesn't select all the way down to the lowest subcategory. 5) The actual search should not be performed until the user clicks on "Search" ( as opposed to automatically upon picking the last subcategory) 6) If possible, the feature should not interfere with the contributions for images, SEO urls, ship in cart, quick checkout (without account). I will follow-up with the specific contrib numbers... ## Deliverables 1) All required php and javascript files, commented 2) general osCommerce installation instructions ## Platform osCommerce 2.2-MS2