How to load Multiple Tiled Bg's on both screens

[NightFox]

Hi!
I started few days ago to coding only with LIBNDS (i was coding with PALIB from 2 years).
I triyin to migrate the funcion si made for my games to libnds, but i got some troubles (i'm a noob using libnds).
I got working load a tiled Bg's from fat, (i converted it with GRIT), but i can't find any example about how to load 1 palette for each bg's (on separate layers) and sometimes i got graphics messed. Oh yes, and i cant' get it works on botton screen.
I upload here: http://www.mediafire.com/?wzayjyowvon the whole project (in visual c++) then original bmp with grit and the bat to make a ROM compatible with NO$GBA (for testing) If anyone can help me to make it wokrs i'll be thankfull a lot ^^

Regards

Fox