Here's something that will be hard to describe but i'll try my best anyhow...
I have a flash site that once finished will be exported as a swf and imported
into an html file. On this flash site I have little chracters and stuff running
around, but I didnt design those little chracters in the flash site timeline. I
designed them in a entirely different fla. But now since their movements are
just a looping event I want to make their movements into a swf file and import
that file into my main flash site timeline. However, when I do this the movie
tweens for the chracters arent working. Is there some better compression
codec I can use? Can I export the library somehow like in director? Is there
anything I can do? I am very confused...

Hello,
you should try to copy and paste the frames directly from the timeline, into
the main fla timeline (selelt all the frames , right click on the first one,
select copy frames, then make another layer on the main fla file, then right
cick on the first frame of the new layer, and select 'paste frames'