I am having problems with the following site, I am getting popups whenever I am on my Aol account as soon as I type something in my web browser

http://ib.adnxs.com/tt?id[/b][/size]=3189906&position=above&referrer=aol.com&size=728x90&cb=9914.

My settings are set to block all popups but these are coming up every 5 seconds so I am unable to use my Aol to do anything other than read my emails! Can anyone help PLEASE??? Thanks for reading