onPress doesn't scroll continuously - help?

programming flash
1

Hello,

My btns don’t scroll continuously when I use onPress -

How would I get the scrolling function to repeat itself while the btn is being pressed?


_global.mainTL = this;
//load an image into the pic clip inside the window clip

//create scrollable clip
mc_win.scrollRect = new flash.geom.Rectangle(0, 0, 300, 200);
//--------------------------------- end initialization -----------------------\\
//--------------------------------- code for scrollers -----------------------\\
btn_up.onPress = function() {

    target = mainTL.mc_win;
    var scrollUp = target.scrollRect;
    var scrollmax = target._y;

    if (scrollUp.y>scrollmax) {
        scrollUp.y -= 10;
        target.scrollRect = scrollUp;

    }
};
btn_down.onPress = function() {

    target = mainTL.mc_win;
    var scrollDown = target.scrollRect;
    var scrollmax = scrollDown.height;

    if (scrollDown.y<scrollmax) {
        scrollDown.y += 10;
        target.scrollRect = scrollDown;
    }

};
//--------------------------------- end scroller code -----------------------\\
stop();