How to display categories in the left column

[spark]

Hi,

A quick newbie question (I'm loving 68classifieds so far!) - has anyone placed the categories in the left hand column? I'd like to do this so that the categories are always visible for the user. Ideally I'm wanting to change the code into a seo friendly <ul><li> setup, with a possibility or nesting the sub categories and displaying them too if required.

Has anyone of you already done such a thing? Is there an example of the code that I could look at just so I'm not reinventing the wheel?

Many thanks,

Konrad