I get ya now! I assume that the Big Circle is the "Current Page" correct? when you click on the small white circles you go to that page and it should then become a big one?
If that is the case, you can set a separate transformation for the "Current Page Transformation" in the repeater, and have the Big circle with the image be that display, the normal transformation just be the small white dot.
If it isn't the current page, but it should be big and an image vs. small and just a white dot based on some other logic, then i would recommended use the Text/xml transformation type in your repeater and you'll have to set condition macros to display one way or the other depeneding on some logic.
If that still doesn't solve it, i can try to find a way to chat to help, but try using the Current page transformation.