apply new image to 3d graphic

I need a 3d file updated. It has an image on the front. I need it to have a different image on the front. It might need to happen 4 or 5 times as I update the image to see what looks best. Should be a 2 minute job each time for someone who knows how. Only thing it takes to get this quick job is an example of how you can apply a different image to the 3d file. located here: [login to view URL] final product will be a google sketchup file that I can manipulate. or if you don't have sketchup, a 2d export at the appropriate angle/vantage point. I can give the file to you in sketchup or export it as autocad or some other 3d formats. Thanks!