code: function(container, x, y)
  	{
  		var origin = mxUtils.getScrollOrigin(container, false);
  		var offset = mxUtils.getOffset(container);
  
  		offset.x -= origin.x;
  		offset.y -= origin.y;
  		
  		return new mxPoint(x - offset.x, y - offset.y);
  	}
docs: Function: convertPoint
  
  Converts the specified point (x, y) using the offset of the specified
  container and returns a new <mxPoint> with the result.
  
  (code)
  var pt = mxUtils.convertPoint(graph.container,
  mxEvent.getClientX(evt), mxEvent.getClientY(evt));
  (end)
  
  Parameters:
  
  container - DOM node to use for the offset.
  x - X-coordinate of the point to be converted.
  y - Y-coordinate of the point to be converted.