GBA info about gba roms please, i need help with my queston :-(

I'm sorry for my English. it's very bad, so i hoop that unless that somebody my could help.
Do somewhone please tell me what for card i need for my gameboy advance so i could put game's from here on it?
I now that my Nintendo ds have a R4 card en i have there the software on and play the game's that i download.
But now i want to do that with my gba, and i want to buy a card where the game's switch to (gba Roms).
And i need to now witch software i need to putt on it.Who can PLEASE give me an answere?????
Thanks!!
Renate

I think the GBA flashcart is called a GBA linker.

Yeah they're considered linkers, although people call them flashcarts, since there's NDS flashcarts. Check out some of their reviews on http://www.gbatemp.net/.