When the sample code for the jwbox image example is loaded inside a div via jquery ajax request code in php.
The black overlay is always ontop, in IE and FF for me, not effected by any z-level changes to it or its containing page.
It does however work if the sample code( http://www.longtailvideo.com/support/tutorials/JW-Player-Lightbox) is adjusted to read instead:
Click the close button to return to the web page.
Click the image to display the image in a JW Box.
optionaly as well you can disable the line in jquery.jwbox.js which normally appends the
into the DOM
Line 48: // $(”body”).append(’
‘);