webdudek - 6:42 am on May 17, 2006 (gmt 0)
are you sure it is really Yahoo that you are banning?
What does the ad trying to sell?
It might be Yahoo affiliates.
Yahoo has affiliates programmes for web hosting and such.
It might be an affiliate that shows display URL yahoo.com and the real URL is yahoo.com/?fdsafdskjafhdlkjsfds43h2j4ghkj32ghkj3