Checkout: Fallback to iframe not popups.
Checkout: Fallback to iframe not popups.

Only Opera struggled with the iframe, while using popups is nasty
and changing the window.location causes the onbeforeunload event to
be fired, closing the users tabs and requesting that they save their
edited files. This isn't desired just to do an export.

jmorse/cyanide,jmorse/cyanide,jmorse/cyanide,jmorse/cyanide