X-Cart forums - i really need help please. $parentid and $categoryid

First I want to say thanks html_sucks for this original code
http://forum.x-cart.com/viewtopic.php?t=14905&highlight=subcategories

I made a few changes using his code in order to display subcategories on top of the menu.

Here what is looks like:

Home page menu display
----------------------
- Books
- CD - DVD - Video
----------------------

// 1st tier

When you click on books, the menu changes to
----------------------
Categories in this section are:
Internet (6)
Software (4)

- Books
Internet (6)
Software (4)
- CD - DVD - Video
----------------------

// 2nd tier

But when I click on the Internet section of the subcategory, the menu changes back to
----------------------
- Books
- CD - DVD - Video
----------------------

// 3rd tier

I think X-cart uses {parentid} to display for the 1st and 2nd tiers and then uses {categoryid} for the 3rd tier.
They did this so that the 3rd tier would have a default category by its own.

for example.

Your Company Name :: Books :: Internet :: PHP book
{parentid} {parentid} {categoryid} {categoryid}

You can click on Internet and see a list of PHP books.

It's when I click on the 3rd tier, this code doesn't function.

Please help!

Here is the code:

In my categories.tpl

Code:

{capture name=menu}



{section name=cat_num loop=$subcategories}



{if $subcategories[cat_num].product_count eq "0" }









<a href="home.php?cat={ $subcategories[cat_num].categoryid }" class="ProductTitle">

{ $subcategories[cat_num].category|escape }</a>







{elseif $subcategories[cat_num].subcategory_count gte "0"}






<a href="home.php?cat={ $subcategories[cat_num].categoryid }" class="ProductTitle">

{ $subcategories[cat_num].category|escape }</a>




({$subcategories[cat_num].product_count})





{/if}

{/section}