You can also get custom covers with YAMJ without downloading anything...
01. In the moviejukebox.properties (or moviejukebox-Mede8er.properties) file in the root directory where YAMJ is located be sure you have this entry...
filename.nfo.skipUrl=false
02. In the movie.nfo file, include an entry similar to this...
<movie>
<thumb>
http://server.domain/pictures/movieposter.jpg</thumb>
</movie>
If you would like to have the poster on your local computer, but want it in a central directory (not in the movie folder), then...
<movie>
<thumb>file:///C:\directory\path\images\movieposter.jpg</thumb>
</movie>
Make sure the poster is in portrait mode, not landscape, or it will not work. I find the best size to be approximately 1000x1500, but I use a skin with large posters. You may be able to use smaller, but the proportions should be the same (like 500x750 or 300x450).