so it works!
IE visitors won't see the overlay and flash won't disappear; other
browsers will see fancybox with overlay over the flash content
example:
<script type="text/javascript">
// for all browsers
$(document).ready(function() {
$("a#pic1").fancybox();
$("a.pic2").fancybox({
'hideOnContentClick': false,
'zoomOpacity': true,
'zoomSpeedIn': 500,
'zoomSpeedOut': 500
});
});
</script>
<!--[if IE]>
<script type="text/javascript">
// for IE only
$(document).ready(function() {
$("a#pic1").fancybox({'overlayShow': false});
$("a.pic2").fancybox({'overlayShow': false});
});
</script>
<![endif]-->