LG CG225 weird wallpaper fit

I recently got an LG CG225 (with Cingular), cropped some pictures up to 128x128 resolution, uploaded them to a site, and downloaded them successfully to the phone. For some reason, these pictures do not fit the whole screen on the phone when I set them to wallpaper and there's a white border around them all. Ok... So I make the pics 138x138, thinking they were just too small. They look exactly the same when set as wallpapers, only the 138x138 ones are clearer. I don't get this border with pictures I take with the camera and it's not on the stock wallpapers, just the JPEGs I downloaded to the phone from the internet.

So my questions are
1. Can I stretch the images to fit the whole screen?
2. Can I change the color of the background from white to black (most of my walls are dark colored so that'd work too)
3. What resolution and/or format should the images be in to fit properly.
4. Is it supposed to be like that/can it even be fixed?

Thanks for the help

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The screen is not square. Try 160x120, 320x240 or 640x480. The last probably will be shrunk to fit the screen. You should able to use the menu to see the dimensions of the built-in wallpaper images.

Are you sure it's not square? It sure looks it to me, the square sized pics make a pretty evenly sized border around all sides, and http://www.mobiledia.com/reviews/lg/cg225/page1.html claims it is 128x128 (3rd to last paragraph on that page). I think I'll amp up a few larger and different sized pics if I have to, but I want to get a definite answer before I go spending more money on downloading these things .

And where can I find the pic info with the phone menu? Sorry I don't know much about what I'm doing.

I stand corrected. That means all of its camera pictures would not fit the screen without stretching or shrinking.