On the right for me, regardless of platform (iOS, Win 7), carrier (Sprint, ATT), radio technology (3G, Hdspa, Edge, Cable) or browser (Safari, Internet Explorer, Firefox no AdBlock). Being on left has something to with browser options possibly. That they suddenly appeared with carrier switch is likely coincidence. Popup blocker won't block them because the are not popups, rather on the page. Even with AdBlock you might still be downloading, just not displaying, not sure at which level that works.
You could probably turn off display of all images, but space on page is still reserved to maintain format.
Tom Test
Itasca Spirit 29B