*script bang !WallDefault
*script exec !TextReplace "$themedir$Theme.rc" "^\*Script start !wallpaper" "*Script start !wallpaper .stretch \#WallpaperPath\#UniverseMetaLS.jpg"
*script exec !wallpaper .stretch "$WallpaperPath$UniverseMetaLS.jpg"
*script ~bang

change "UniverseMetalS.jpg" by the file you want to be your wallpaper...
make sure that file is in the same folder as the "UniverseMetalS.jpg"

this should do the trick for you LadySmith!