If the user embeds the flash client on their own page, if someone then
clicks something to visit a msoy page, we will be unable to load that
page in that same tab/window. Instead, we'll be forced by flash security
restrictions to open in a blank window.
Allow for either method, falling back to a blank window if the other
method fails.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4289 542714f4-19e9-0310-aa3c-eee0fc999fb1
Michael Bayne