Return at level 0 in a specific MC frame by clicking in other level

I have a movie that loads (by a button) others swf’s in level 1, 2…

My problems are:

1 - These buttons functions, in level 0, being still working when I “loadMovieNum” and then I have another ones above in levels 1, 2…
How can I make the bellows buttons (level 0 - “invisible”) to stop working?

2 - I used “tellTarget” function in level 0, inside a MC, that jumps to frame 100 to 150 and stop. And so it loads another swf’s in levels 1, 2…Nice.
Otherwise, when I “unloadMovieNum” 1, 2… and it returns at level 0, the playhead is on frame 150.
How can I return at frame 100 by the same click?