What size should take a picture to be wallpaper for a Palm Pre?

I was wondering what size should take a picture a wallpaper for my Palm Pre. The one I had saved before black around the edges, as there was no whole way. Thanks.

A perfect fit Pre screen is 320×480 pixels. Well, this is the same position ratio of the iPhone and there are already many sites iPhone wallpaper, you can easily download the use of the prior without cropping or distortion. On the other hand, recently started pre set your Wallpaper Gallery where you can download (and send!) Funds screen! http://www.preinsiders.com/zenphoto/index.php