You can put up banner on kasoa with connection to a specific category, or just a in general.
The specified banners will target user that search for a specific category in kasoa.
There are 3 spots to show banners on, at the bottom of the first page. And then at the top and right side of the rest of kasoa site.
If your are interested in getting your banner on kasoa, contact support for price and information.
A banner needs to be .gif, .jpg or .swf file with a max width of 160px and free height for a vertical banner and a max width of 800px and max height of 100px.