tween from current position

[christoon.ca]

Hey dev'rs

I would like to be able to tween an image dynamically from it's current position on a mouse over event. A good example of what I want can be found here. (the nav cloud)

I haven't been able to find anything on jquery or anywhere else, so here's what I've come up with so far:

// this is the code to find the current y position (slightly altered from here) 

function findPosition( oElement ) {
  if( typeof( oElement.offsetParent ) != 'undefined' ) {
    for( var posX = 0, posY = 0; oElement; oElement = oElement.offsetParent ) {
      posX += oElement.offsetLeft;
      posY += oElement.offsetTop;
    }
    return [ posY ];
  } else {
    return [ oElement.y ];
  }
}

// this function is called from the mouse over event with the 'findPosition' function in the 'tween from' area. (tween from jstween)

function moveCurlybrace()
{
  cbTween = new Tween(document.getElementById('galleryCurlybrace').style,'top',Tween.regularEaseOut,findPosition('galleryCurlybrace'),300,.5,'px');
  cbTween.start();
}

I spent all day trying variations of this model, but nothing has worked so far. I've also looked everywhere for a similar solution. Am I even on the right track here?

Any help/feedback appreciated.
Thanks

[christoon.ca]

You can see it in all it's crappy-nes here.