Fix for DateTextBox inside of iframe.  Fixes #7979.
Fix for DateTextBox inside of iframe.  Fixes #7979.

Actually this is cleanup from [15197] (refs #6519); forgot to change a reference from <body> to the document.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@15692 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful