Fixed Positioning in IE6 Lytebox

[zero002021]

At work, I've been developing a website for an interior design company. The site works fine in all browsers but Internet Explorer 6. When a user clicks on an image in the portfolio, it's supposed to stay centered on screen via fixed positioning. However, IE6 doesn't support fixed positioning, and the IE6 hacks I've tried haven't been working.

Any ideas how I can get this working in IE6? Any help would be appreciated.

http://orangestreetdesign.com/portfolio_lytebox.php