How do i change the access rights for every file in every sub-folder?

I have an external drive that was shared between my PC and my iMac (running Snow Leopard 10.6.5).
Some of the files created by my PC have the following access rights (privileges):
Me: Custom
staff: Custom
everyone: Custom
I want every file to have the following access rights (privileges):
Me: Read & Write
staff: Read & Write
everyone: Read & Write
I presume that I need to go into the terminal and run some command line program, but I have no idea what program or what options (or even where to look for such a program). Can someone tell me how to do this, so that every file in every sub-folder has the same access rights?

Well, that's different. Most people do not install anything on their PC to read an HFS+ disk, so I assumed it was formatted for the PC. [See my above post|http://discussions.apple.com/thread.jspa?messageID=12843313#12843313].
Note that it is the same as what you asked about, except with numbers instead of the letter equivalents.
Posix permissions are for User;Group;Other (ugo) and each one can have read/write/execute permissions. Read = 4, Write = 2, and Execute = 1. So, for rwx you set 421=7.
I try to make it safe by not typing in the file path. If you do what you posted, you will change the startup volume's permissions. The path to your external is /Volumes/ext hd mount point. If you start typing the path and accidentally hit return before finishing the full path, you could fubar something you didn't want to. So, I type the command, leave a space, and then drag the target to the Terminal window.
You might also consider the GUI based permission changing program, [BatChmod|http://www.macchampion.com/arbysoft/BatchMod/Welcome.html].
Message was edited by: Barney-15E

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