Another Question about XML Thumbnails and Tweening

programming flash
1

created the gallery and made thumbnails vertical everything works fine except my tween for the thumbnails.
i need help disabling the hit_up and hit_down buttons for the amount of time the tween is going on so someone can’t click on the button till the tween is finished.


hit_up.onRelease = function(){
    if(thumbnail_mc._y > 0 ){
        //do nothing
    }else{
        y_pos = thumbnail_mc._y;
        new Tween(thumbnail_mc, "_y", Strong.easeOut, y_pos, y_pos+60, 1, true);
    };
}


hit_down.onRelease = function(){
    if(thumbnail_mc._y <= (total-7)*-60){
        //do nothing
    }else{
        y_pos = thumbnail_mc._y;
        new Tween(thumbnail_mc, "_y", Strong.easeOut, y_pos, y_pos-60, 1, true);
    }
}