Revise formula for calculating pageX/pageY in the main document based on event object from the <iframe>'s <body> node.  Refs #9606 !strict.
Revise formula for calculating pageX/pageY in the main document based on event object from the <iframe>'s <body> node.  Refs #9606 !strict.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@19095 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful