Loadeenng

ok here's what i want to do: i want all windows to use the default skin except for the group window, which i want to have a picture as a background, i've already done this by creating a new template, and i have saved an image as the exact size in pixels of the window. however when i load it up the image is all stretched (to 256x256 i'm assuming) and only half of it shows. does anyone know of a way to correct this so that the entire image is in the window?