This is a better system.

http://www.raumplusna.com/

Try this:
http://www.renovation-headquarters.com/doors-sliding.htm

I put in a similar sliding door. I purchased the hardware here...

http://www.hangingdoorhardware.com/

The hardware is fantastic, and slides better then I would have ever imagined. Then I purchased the door seprately and put the two together. Otherwise you can go with someplace like Bartel, but you'll be paying an arm and a leg for their sliding door systems.

http://www.bartelsusa.com/

Bether,
That hangingdoorhardware.com website is amazing!!! But can I ask where you got the sliding doors????

THANKS!

I've found the following website some time ago and thought it would make a great solution for double duty:

http://www.woodfold.com/bookcase/index.php

Product details for doors:
Available in custom widths from 36" to 66”
Constructed entirely from durable ¾“ ApplePly™ that supports loads up to 500 pounds
Available in three hardwood veneers (Oak, Cherry and Maple), unfinished or finished in environmentally safe clear and customized stains and paints
Includes a valance matched to your chosen finish
Includes two fixed shelves at center and bottom, with four additional, quickly adjustable shelves
Offers superior strength due to a piano-hinge that runs the entire length of the bookcase
Assures incredible longevity and smooth operation thanks to a heavy-duty steel roller system with anti-binding block

Wow, getting back to this a little late, but I got my door at a business here in San Francisco called Discount Builders. They sell basic windows & doors. I bought a frosted glass door without a door knob and hitched it up to the sliding door system. It works great!