really?? is really so much complicated for you to find the CWM package to flash trought Odin???
LOOL!!, you only had to browse this same forum section till this thread, that is located 5 five topic below this one..
http://xdaforums.com/showthread.php?t=1151396
it was not so much difficult, was it??
anyway: DON'T flash a CWM Recovery trought ROM Manager if it doesn't not show up your own telephone model, in this case our Galaxy5!!! If you do that you will brick your phone (well, not a proprer brick but users who did t they need to bring the phone for Assistance)!!
Actually ROM Manager is quite useless 'cause you cannot flash last CM7 versions with it: you will still need Odin if you are flashing CM7 for the first time ('cause you have to flash a CWM Recovery). If you still have CM7 just download your file and reboot in Recovery..
hope that helps..