Loading SWFs Into FLAs and Making the SWFs Transparent! HELP!

I have a set of buttons inside a movieclip, inside a movie clip (if that makes sense).

When the buttons are clicked I need them to load a content .swf file into frame 2 at at specified position (x=20, y=140)

I also need the .swf being loaded in to have a transparent background.

How can I achieve this?

I cannot include the .fla files for your perusal because the KirupaForum uploader can’t upload bigger than 2mb and my zip file is 5.28mb or something like that.