counting clicks on a flash ad

Hi all! in the current site that im building there are flash banners for advertisment. now the owner of the site want to know how many times a banner got clicked and viewed. here i got a problem... the flash banners direct to another sites (changing all the time) and i cant figure out a way to tell my server that the banner got clicked and to update my db because of it. i thought on redirecting but as far as i know flash files contain their own link and that link cant be changed (created when the flash get compiled). does anyone know a way to count those clicks? or just got a link to a site which explain alittle? with thanks in advance Ben-Nes Yonatan