onMouseMove function not working

programming flash
1

Ok, the code below does get called when the mouse moves, but its like it doesnt re-run the tween until the the mouse stops moving. Any idea on how to fix it?

see example at:
www.ronnieswietek.com

click on portfolio and select web or interactive from the drop down and you will see what I mean.


mouseListener = new Object();
mouseListener.onMouseMove = function() {
    if (mc_mask.hitTest(_root._xmouse, _root._ymouse, false)) {
        mousePosX = (_root._xmouse-mc_mask._x);
        mousePosY = (_root._ymouse-mc_mask._y);
        proxX = Math.abs(mousePosX-mc_mask._width/2)/(mc_mask._width/2)*10;
        proxY = Math.abs(mousePosY-mc_mask._height/2)/(mc_mask._width/2)*10;
        pic.tween("_x",_root._xmouse-(pic._width*(mousePosX/mc_mask._width)),20/proxX,"easeOutExpo");
        pic.tween("_y",_root._ymouse-(pic._height*(mousePosY/mc_mask._height)),20/proxY,"easeOutExpo");
    }
};

Mouse.addListener(mouseListener);