Simple load movie questio

hi there .
I’m new in this forum . nice place !
I have some question about load movie
I have 1.swf and in last frame I load 2.swf in a symbol .
in 2.swf I have a movie clip and in this movie clip have a button with :
on (release) {
_root.gotoAndPlay(177);
}
normally when I open 2.swf this button play frame 177 in 2.swf root timeline but when I load this from 1.swf this go to frame 177 of 1.swf .

how can I slave this ?
t h a n x