#152 Fixed a drag regression in NS4, Mac

[Benoit Marchant]

The drag was broken in Netscape 4, the layer only moved
when mouseup. Compared with dynapi2, and foudout that
these 2 lines were in dragstart in dynapi2 and were
missing in dynapi3:
e.preventDefault();
e.preventBubble();

I tested with the other browsers and everything was
fine. It did fix an issue with NS6 when draging nested
layers, when both are draggable.

[Benoit Marchant]

[Benoit Marchant]

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