Have you tried going to teamspeak viewer. This site will allow you to register you TS3 and create a banner for you site. Once you have registered you teamspeak go to it and click server banner. This page will give you a verity of banners for your webstie.http://www.tsviewer.com/
I used this for our cod4 banner. Which I used gametrackers.com to get my banner.
Hope this helps