Open a pop-up window from flash.

hi i have some issues with a page im doing.

1. i have an intro.swf that have 3 buttons, each one loads an external movie inside itself.
loadMovie(" http://www.url.com/test.swf", "cont");
stop();
it works fine.

2. then inside test.swf i have others buttons opening a new window using javascript:
on (release) {
getURL("javascript:NewWindow=window.open(' http://www.url.com/testpage.html','1','width=500,height=550,left=0,top=0,toolbar=No,location=No,scrollbars=Yes,status=No,resizable=No,fullscreen=No'); NewWindow.focus(); void(0);");
}
3.also i have some get url _blank buttons inside test.swf

here comes the weird part, its related with the pop-ups using javascript. when i built it for the fisrt time it opened in firefox and explorer 6 without any issue, then in other computer it didnt open the popup at all.
right now i cant make it work.

i begin testing the swf outside by itself, not loading it from "cont" in intro.swf, and it worked i all computers and browser i try it.
so i think the problem comes when i call and load the test.swf inside the intro.swf
do i have to do something im missing? levels? special scripts on intro.swf?.
intro.swf is composed like this:

- first frame stop (movie clip with intro images)

- button 1:
on (release) {
gotoAndPlay(4);
}

- frame 4:
unloadMovie("cont");
gotoAndPlay(4);

- frame 5:
loadMovie(" http://www.url.com/test.swf", "cont");
stop();

"cont" is a movie clip with a frame for test.swf, doesnt have any actions within its timeline.

can somebody help me.
thanks.