crystal key crisis part 2

thanks odinslyn, very helpful! ;-)
but unfortunately i'm stuck again, a bit farther though, i went to the jungle did everything i had to do, wne t also to the dome and found the portable portal, went again to the jungle and the alien crashed enemy spaceship with a cd and discovered the code for abandon ship, and i'm back to the desert, that's where i'm stuck, anybody can help me?!? I'm desperate!!!