Help With BitmapData

Hi to all!

I'm somehow new to AS3, and recently I stumbled upon some problem that I just can't figure it out. So I have 2 classes wich produces a simple ripple effect. The thing is that I just can't put some image as background for the effect. Right now I'm out of ideas so any help is appritiated.
Here is the code itsfelf:
Ripples.as (main document class)

Code:
package
{
import flash.display.Sprite;
import flash.events.*;
import RippleCanvas;

public class Ripples extends Sprite {

private var subobj:RippleCanvas;

public function Ripples() {

trace("Ripples started..");
var subobj = new RippleCanvas();
this.addChild(subobj);

}
}
}
RippleCanvas.as (subclass of Ripple)

Code:
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.events.*;
import flash.geom.*;
import flash.filters.*;

public class RippleCanvas extends Sprite
{

internal var sourceBmp:BitmapData;
internal var paintBmpData:BitmapData;
internal var paintBmpData2:BitmapData;
private var buffer:BitmapData;
private var paintBmp:Bitmap;
private var output:Bitmap;
private var brush:Sprite;
private var logo:Sprite;
private var filter:BitmapFilter;
private var filter2:BitmapFilter;
//public var Mis:Boolean;
private var dispFilt:BitmapFilter;

private var outputBmpData:BitmapData;
private var surface:BitmapData;

internal var pt = new Point(0,0);
internal var matrix1 = new Matrix();

public function RippleCanvas()
{
paintBmpData = new BitmapData(128, 98, false, 0x40);
paintBmpData2 = new BitmapData(128, 98, false, 0x40);

logo = new Sprite();

brush = new Sprite();
brush.graphics.beginFill(0xFFFFFF,1);
brush.graphics.drawCircle(0,0,4);
trace ("RIppleCanvas started..");

surface = new BitmapData(128, 98, true, 0x000000);
surface.draw(logo);
//var ty:picture = new picture();
//var sourceBmp:Bitmap = new Bitmap(picture);
//addChild(sourceBmp);
sourceBmp = new BitmapData(128, 98, false, 0x40);
buffer = paintBmpData.clone();
outputBmpData = new BitmapData(128, 98, false, 0x40);
scaleX = 8.0;
scaleY = 8.0;
//this.addEventListener(MouseEvent.MOUSE_MOVE, this.moveHandler, false, 0, true);
this.addEventListener(MouseEvent.MOUSE_DOWN, this.downEvent, false, 0, true);
this.addEventListener(MouseEvent.MOUSE_UP, this.upEvent, false, 0, true);
this.addEventListener(Event.ENTER_FRAME, this.update, false, 0, true);
paintBmp = new Bitmap(paintBmpData);
var cmat:Array = [ 1, 1, 1,
1, 1, 1,
1, 1, 1 ] ;
filter = new ConvolutionFilter(3, 3, cmat, 9, 0);
filter2 = new BlurFilter(4,4);
output = new Bitmap(outputBmpData);
// output.blendMode = BlendMode.ADD;
//paintBmp.blendMode = BlendMode.ADD;
addChild(output);
addChild(paintBmp);
// var tf = new TextField();
// tf.text = "testing123";
// addChild(tf);
disp = new DisplacementMapFilter(paintBmpData2, new Point(), 4, 4, 48, 48, DisplacementMapFilterMode.IGNORE );

this.filters = new Array(new BlurFilter(16, 16));

}
function update(e:Event)
{
if(parent!=null) {
//&& Mis==true){
var localPt:Point = parent.globalToLocal(new Point(parent.mouseX*0.125, parent.mouseY*0.125));
var m:Matrix = new Matrix();
m.translate(localPt.x, localPt.y);
sourceBmp.draw(brush, m, null, 'invert');
}
//trace (localPt,Mis);
paintBmpData.applyFilter(sourceBmp, paintBmpData.rect, pt, filter);
paintBmpData.draw(paintBmpData, matrix1, null, 'add');
paintBmpData.draw(buffer, matrix1, null, 'difference');
paintBmpData.draw(paintBmpData, matrix1, new ColorTransform(0, 0, 0.98609374, 1, 0, 0, 2, 0));
paintBmpData2.draw(paintBmpData, matrix1);
outputBmpData.applyFilter(surface, outputBmpData.rect, pt, disp);
buffer = sourceBmp;
sourceBmp = paintBmpData.clone();

}
public function downEvent(e:Event)
{
if(e.stageX == 0 && e.stageY == 0)
return;
//trace("ok",Mis);
var curPt:Point = parent.globalToLocal(new Point(e.stageX, e.stageY));
//var Mis=true;
e.stopPropagation();
}

public function upEvent(e:Event)
{
//var Mis=false;
e.stopPropagation();
}
}
}
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