I have an app where I'm drawing draggable objects within an iframe.
For design reasons, the iframe is borderless, has no internal scroll
bars, and needs to look as if it were a part of the parent window.  In
other words, it's invisible.

The iframe has several draggables and droppables that may extend
beyond the borders of the parent window (i.e. a tall iframe) but would
otherwise be entirely within the boundaries of the iframe itself.

For security reasons, I can't show you the actual page, but I've drawn
up a mock-up that illustrates what I'm describing:


Since the iframe has the same dimensions as its child document, the
draggable never traverses its boundaries.  Because script.aculo.us
never detects the border collision, it never calls the Draggable
scroll method.

So my question is if there is a way to make the draggable detect
scrolling beyond the border of the parent window and scroll it.  To
put it another way, is there a way to make the draggable behave as if
its a part of the parent window, not the iframe.

Many thanks in advance for your help.


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