images and instant publishing to work correctly

I have put images into a container and they are distored and pixelated. The container is then linked to another page where the images show up but are pixelated? I have also tried putting them not in a container and that shows up pixelated as well. any help here on instant web publishing and images would be great. have tried pngs, gifs, jpegs at 300 resolution. Trying to make it work for both mac and pcs and printable. help!