How to add custom items links to main navigation?

[DyaGa]

Does anybody know how to add custom navigation items to main navigation?

Example:
We have a site structure:

Page1
--Subpage1.1.
--Subpage1.2
-- ...
Page2
-- Subpage2.1.
-- ...
Catalog
Page3

...and some custom extension (SomeCatalog) with items categories

Category1
--Subcategory1.1
--...
Category2
Category3

each category has own alias, so we can generate unique link for it (this is not a problem), as example for Category1 link would be

http://some-site/catalog/items/category1.html

So, how to add this Catalog categories links to main navigation? I need to have this structure in main navigation:

Page1
--Subpage1.1.
--Subpage1.2
-- ...
Page2
-- Subpage2.1.
-- ...
Catalog
--Category1
----Subcategory1.1
----...
--Category2
--Category3
Page3

[Ruud]

Must it be generated automatically? If not, just create redirect pages that point to the url that gives that category you need.

I can recall a catalog navigation module, it might exist. Alternatively you can list categories, adjust the template to make it appear as a menu and use it as a submenu. Sorry, that is the best I can do. Anyone else?

[DyaGa]

Thanx for answer.

Must it be generated automatically?

Yes, it must be generated automatically on all pages.

I can recall a catalog navigation module, it might exist.

It's not Catalog extention, it is custom extention. Besides, I am using Taxonomy to list categories hierarchy, so data:

--Category1
----Subcategory1.1
----...
--Category2
--Category3

are from Taxonomy table. And I have made function for rendering Navigation depending of this hierarchy, but I have no idea how to insert this generated code in main navigation...

Alternatively you can list categories, adjust the template to make it appear as a menu and use it as a submenu.

Will try, but i think it's not a solution.

[Tru]

Some time ago I had a similar problem, I solved it with this code http://pstbn.com/6FGIU3i. You will need to modify it, but should give you the main idea.

[DyaGa]

Tru, thanks, I will think about this HOOK, but I don't like the idea of replacing with preg_replace...