Working with External Navigation help!

Hi friends,

I have two files
[INDENT]
main.swf & nav.swf
[/INDENT]In main.swf i have two frames on Layer1 “s1” & “s2

on Layer2 i used the following scripts to load nav.swf

 
loadMovieNum("nav.swf", 10);

Which works perfecly fine.

But on nav.swf ( external file ) i have two buttons on the stage,

on the 1st button
i have used the following script to go to “s1” frame which is on the main.swf

on (release) {
 _root.gotoAndPlay("s1");
}

i have used the following script to go to “s2” frame which is on the main.swf

on (release) {
 _root.gotoAndPlay("s2");
}

Which seems to be not working fine. Any idea??
I have also attached those two fla files.