How to display neighbor categories on a category page

[Alain D.]

Hello,

I'am wondering how to display neighbor categories of a category, on this specific category page.
It's almost the same thing from product page on which you can display other product of the same category but i need it to work with category page.

Let me be more explicit, here is a categories tree for exemple :

1. CAT 1
   1. CAT A
   2. CAT B
   3. CAT C
2. CAT 2
   1. ...

I would like to display on the CAT A page its neighbor categories (CAT B and CAT C).
In fact, I am looking for a way to propose to the visitor the categories of the same thematic, like "don't forget to check this catgories too" (with name and image of this categories).

So i suppose I have to get the parent category of the current category and then find a way to display all subcategories of this parent without including the current one.

In other words and with the same example from above :

On CAT A > get CAT 1 (id) > list CAT A subcategories > exclude CAT A (current one) to get only neighbor categories.

Does anybody have an idea of how to proceed ? Or maybe some tips to give me ?

Thank you in advance for your time.

 

PS version 1.6