Tried XGL - How to turn it off now?

Dear list! After disabeling XGL in GNOME (with the XGL-Button in Control-Center) my Windows don't have titels nor borders, Alt+Tab isn't working, also everything which was animated within XGL before. How to get it back (at least until I bought the hardware needed - Athlon 900MHz 256 Megs Ram and Geforce2 isn't sufficent I can say)?? Thanks, Johannes