Dynamicaly create moving balls

1

ok i have

 var theXML:XML = new XML();
theXML.ignoreWhite = true;
theXML.onLoad = function() {
    var nodes:Array = this.firstChild.childNodes;
    //nodes.length = int amount;
    for (i=0; i<nodes.length; i++) {
        
        text_on = nodes*.attributes.desc;
        id_on = nodes*.attributes.id;
        theList_2.addItem(text_on, id_on);

        var t = attachMovie("ball", "ball"+i, i);
        t._x = Math.random()*800;
        t._y = Math.random()*600;
        t.dx = Math.round(Math.random()*800);
        t.dy = Math.round(Math.random()*600);
        t._xscale = Math.random()*50+40;
        t._yscale = t._xscale;
        t.onEnterFrame = mover;
        //captionFN(true, text_on, id_no);
        //t.onRollOver = captionFN(true, text_on, id_on);
        //t.onRollOut = captionFN(false, text_on, id_on);
        //roleOver(id_on, text_on, true);
        //t.onRollOut = roleOver(id_on, text_on, false);
        
        t.onRollOver = captionFN(true, text_on, id_no);
        //this.onRollOut captionFN(false);
        };
        //captionFN = function (showCaption, captionText, bName) {
    }

function mover() {
    this._x += (this.dx-this._x)/20;
    this._y += (this.dy-this._y)/20;
    if (Math.round(this._x) == this.dx) {
        this.dx = Math.round(Math.random()*600);
        this.dy = Math.round(Math.random()*800);
    }
}
//RollOver
//function roleOver(name_Value, text_Value, bool_Value) {
//}
//////////////////////////////////////////
captionFN = function (showCaption, captionText, bName) {
    if (showCaption) {
        _root.createEmptyMovieClip("hoverCaption", this.getNextHighestDepth());
        cap.desc.text = captionText;
        cap._width = 7*cap.desc.text.length;
        cap._alpha = 75;
        // 
        if ((bName._width+bName._x+cap._width)>Stage.width) {
            xo = -2-cap._width;
            yo = -17;
        } else {
            xo = 2;
            yo = -17;
        }
        hoverCaption.onEnterFrame = function() {
            cap._x = _root._xmouse+xo;
            cap._y = _root._ymouse+yo;
            cap._visible = true;
        };
    } else {
        delete hoverCaption.onEnterFrame;
        cap._visible = false;
    }
};
/////////////////////////////////////////
theXML.load("http://www.namit.org/404_flash/product.php");

ball is an image, how do i add text when i hover over it?