How do I make work? timeline issue?

I have a movie clip on the stage called folder_mc.

In the first frame of its timeline it has another movie clip called posterPDF_mc.

and the following actionscript to make the posterPDF_mc open a pdf file.

posterPDF_mc.onPress = function() {
getURL(“posterPDF.PDF”, “_blank”, “GET”);
};

I have other actionscript which jumps the playhead to a frame 10 when folder_mc is clicked.

The problem is that I want the posterPDF_mc button to only work once the playhead is at frame 10 and not on the first frame where you can see folder_mc.

Is there any way to do this… maybe putting the posterPDF_mc actionscript in the root timeline and then refering to the posterPDF_mc that is located in the timeline of the folder_mc movie clip…?

Much appreciated.