If you have just three images and three corresponding links, I wouldn't recommend using the Image Gallery at all. I'd place the images into an HTML feature instance and make them link to the pages you want. That will be much less work than trying to force Image Gallery to do something it's not designed to do.
You might also consider using the Slide Show settings of the HTML feature. and turn your three images into a rotating, clickable slideshow. You can see how this looks on the main page of our site.
It also sounds like a Nivo Slider feature might be incorporated into mojoPortal in an upcoming version.
Jamie