AS2 - On/Off button that adjusts visibility

I have a button that is a switcher on/off. I have a movieclip that I want it to be visible true and visible false accordingly. If movieclip is visible true then make it visible false. else if it's visible false make it visible true

This is my code:

on(release){
    if(_root.facebtns.eyelashes = _visible = true) {
        _root.facebtns.eyelashes._visible = false;
    } else if(_root.facebtns.eyelashes = _visible = false) {
        _root.facebtns.eyelashes._visible = true;
    }
}