Ladder effect?

programming flash
1

Hi there…
I’m making a photo gallery…
I want my thumb buttons to sit in place with a ladder effect…
I mean first button to y:10, second to y:15 third y:20 and go on… Then all of them to y: 5…
But with tweenmax i can just make them go to their final y coor.
the code is below:

                for (var i:int = 0; i < thumbButtonArray.length ; i++) 
                    {
                        thumbPath            = new String();
                        thumbPath            = thumbButtonArray*.@thumbpath;
                        
                        thumbButton         = new ThumbButton;
                        thumbButton.x         = ( i * (thumbButton.width + 25)) +60;
                        thumbButton.y        = -100 - (i * 10);
                        thumbButton.thumbId = i ;
                        
                        
                        
                        TweenMax.to(thumbButton, 1.5, { bezier:[ { y:25} ], ease:Bounce.easeOut});
                        
                        thumbButton.create(thumbPath);
                        thumbButton.addEventListener(MouseEvent.CLICK, createPicture);
                        thumbButton.addEventListener(MouseEvent.CLICK, holdThumbDown);
                        thumbButton.addEventListener(MouseEvent.MOUSE_OVER, Over);
                        thumbButton.addEventListener(MouseEvent.MOUSE_OUT, Out);
                        addChild(thumbButton); 
                        
                    }

I tried to use delay with tween but I couldn’t manage it…

Any ideas?