Absolute CSS with flash background safari problem

I've built an html site with a flash background div (absolute positioning css etc)

Everything works fine on a pc (I.E. and F.F.), the problem is that on Macs when I use an a:hover{} on text links, the links disappear on mouse over and don't reappear until I refresh the page. This is happening on FF mac and Safari.

I'm using the following parameter to allow the flash to sit as a background div.

so.addParam("wmode", "transparent");

Any ideas? I do want my links to have rollover states......

Dont ask me why but im testing this as well, for the last few months. Please go here:
http://www.quomo.org/2008/index.php

On Safari, when doing a mouse over a link, the divs dissapear.
Did you resolved this issue?