mouse binding problem

[Milandrag]

i have a funny little problem. i bought myself a gamer mouse (gigabyte) and of course it has more than just 5 buttons. but the problem is i can't bind all of them. ok left, right click and wheel is working perfectly whilw my other 2 buttons can't be both binded. I've managed to bind 1 (mouse8) but when i bind mouse 7 (bind "MOUSE7" echo test) i dont get any result out. it is also not mouse 9 since the game says there isn't any mouse9 key. but that button (which can not be binded) IS working outside the game (mozilla, UrT...)
i'm lookin forward for replies :)