Buttons in the way

iv got a slight problem with the coding on one of my buttons. If you roll over the bottom of the screeen the bar pops up with a ‘previous’ button inside the clip. I want the button to become active and go to another part of the root on the time line. The pop up bar works on a roll over command heres the cod

 on (rollOver) {
mouse_over_picture1 = true;
}
on (rollOut) {
mouse_over_picture1 = fstartlse;
}

Picture 1 is the name of the bar. on the layer above in the same movie clip i have this code

  } else {
picture1.prevFrame();
 }
};
picture1.clip.mc_but.onRelease = function() {
 _root.gotoAndStop("scene4")
}

This basically tellss the bar to pop up when rolled over and drop down when rolled off. I f you look at the code you can see iv tried to put the button function of the word ‘previous’ on the same action panel. However, it doesnt work properly. The button starts jumping up and down as the coding is getting confused.

How can i target the button and make it work whilst the bar has poped up. i need the bar to remain up whilts the user clicks the button and only drop down when they have rolled of the bar.

I hope i have explained it clearly!

I hope someone can help me.

Thank you!!!