Thanks for the inquiry. 

 Like many parts of the site, our banner advertising system is 'in transition'.  You can see our old rates and policies at:
http://koreabridge.net/advertising
and slightly more outdated Korean version at:
http://pusanweb.com/adrateskorean.htm

With the new system, we plan on introducing options for text ads, audio ads, and video ads. There will also be more flexibility in how often ads get shown.  We're also going to try to  make advertising more interactive -  providing a more prominent introduction for advertisers and encouraging them to respond to questions and comments from users.   All of that is at least a few weeks away, so perhaps for your client, we can come up with an interim advertising package.  Feel free to contact me directly at manager at Koreabridge dot com