Dragging objects from parent window to showModalDialog

[elizayiu]

Hi,

I need to write a webpage which does the following:
- open up a window and pass parameters into it (i.e. need to call
showModalDialog() or showModelessDialog())
- contains jscript to support drag and drop objects from itself to the
popup window
- wait for user response in popup window and return results back to
the parent window (i.e. calling showModalDialog() is preferred)

If I call showModalDialog(), the focus will go to the popup window,
i.e. I cannot drag from the parent window. If I call
showModelessDialog(), the focus will go to the parent window when I
drag an object from it but it doesn't switch to the popup window when
my cursor move to the popup window.

Is this even possible?

Thanks,
Eliza