i tried something else and it seems tha it works perfect.
i have 145.60mb free and i installed 2 apps and i think that the phones memory stays the same.
i've downloaded rom manager from market.
then i update the clockwork recovery to version 220.127.116.11 and rebooted into recovery
the i have created a ext partion and the phone rebooted 2 or 3 times
then i typed the commants in terminal emulator and done!
so really thank you both for the help!