How to toggle functionality

programming flash
1

Got some code tht allows me to horizontally scroll some thumbnails depending on where my mouse is in relation to a mc named stroke. I need to be able to disable the functionality if I am not over my panel that gets scrolled.

Here is my code.

///////////////////////////////////////
/////    Panel Scroller
///////////////////////////////////////
panel.onRollOver = panelOver1;
function panelOver1() {
    this.onEnterFrame = scrollPanel1;
    delete this.onRollOver;
    updateAfterEvent();
}
var b = stroke.getBounds(_root);
 
function scrollPanel1() {
    if (_xmouse<b.xMin || _xmouse>b.xMax || _ymouse<b.yMin || _ymouse>b.yMax) {
        this.onRollOver = panelOver1;
        delete this.onEnterFrame;
        updateAfterEvent();
    }
    if (panel._x>=200) {
        panel._x = 200;
    }
    if (panel._x<=-306) {
        panel._x = -306;
    }
    var xdist = _xmouse-416;
    panel._x += -xdist/12;
}