changing bitrates on mp3's?

Hey i got a nice collection of mp3's, but most of them were ripped (taken from music cd saved as mp3's) at 192 kbps. I just got an mp3 player, and i want the music to take up less space, so how could i change all of the bitrates to 128 kbps? any programs, freeware, that can do this? thx.
 
I know you can't go from a lower bitrate to a higher, but I am not sure about the reverse. I would just try to re-rip them at a lower one.
 
so confused...
ghost dogg, I've been directed to a lot of other of the LAME sites (couldn't find way around the pun) but confused how to actually work it. I've gone into a lot of pages, downloadd 2 different thing, and the .exe file doesn't work in either, which is really confusing ?:(

could someone help me out here, explain where to go, what to do, or should i just burn all 200+ mp3's to cd's and rip them again at 128
 
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