I was looking through a bunch of the scripts in the DB, but couldn't find one that would let me put in custom wordfilters.  I found one kind of like what I want, but it said it only censors the words?  Does anyone know of a script that lets me put in custom wordfilters?

http://www.msgpluslive.net/scripts/view/172-Parent-Filter/

Edit that so its the words you want. (sent and changed). You can edit scripts right? I'll do it if you can't.

I installed it and went to edit it, I edited it and then when I tried to use it it wouldn't work, it was like the script wasn't even there.  It wasn't in the list when I clicked the script button on the conversation window or the contact list window.  But when I went into script preferences it was there and enabled.  Could this be because I'm using the beta?

No, there is an error in your modified version... you may need to re-write it

It didn't work when it was unmodified either though.