Fixes case in onRollover for SWF6 and link navigation

Almost fixes archived 1638 at http://swf.codeazur.com.br/#bf96303af70c63c04aaca6a4092c68b6bf9465cf0917285f9db41265ca65dad9

Text shows `undefined`, but I think it's related to https://bugzilla.mozilla.org/show_bug.cgi?id=1075263