Hello, When I visit some website, it displays ads from zedo.com, and redirect me to zedo.com if I click the ad. Next time I visit the page, it displays ads from doubleclick.net and redirect me to doubleclick.net too. (Sometimes, it's adserver.adtechus.com instead of doubleclick) When I check out the source code of the page, there are no zedo or doubleclick. I think they may be in some javascript files. My question here is WHO serve ads for the website? zedo or doubleclick? How to advertise on the site? Thanks a lot! Bryan