PLEASE HELP: unloading xml loaded swfs

Hi All,
I have my files nearly complete, but can’t seem to figure out how to unload the swfs in as3 once you click a button to load a new one.

My file works great, with the exception of the videos playing over each other. slight bummer.

I have five buttons that each pull an external swf that is controlled by an xml file. If there were not sound it would not be an issue, but the sound overlaps if you click to the next link before the first video finishes playing.

Thanks!
:d: