The best option would be to change the little circuit board that's attached to the back of the drive. It should just unscrew. You then need something like this:
http://cgi.ebay.com/Laptop-Notebook-CD-DVD-ROM-Drive-to-desktop-IDE-adapter_W0QQitemZ160132544411QQihZ006QQcategoryZ41994QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
That will let you use a standard 40-pin ATA cable and power cable. Just plugging in a 40-pin cable into the 50-pin connector on the back of the drive won't work, as that connector carries power for the drive as well as the ATA signal. It would be possible to hack up something to work... but it'd be far easier just to get one of those adapters.
http://cgi.ebay.com/Laptop-Notebook-CD-DVD-ROM-Drive-to-desktop-IDE-adapter_W0QQitemZ160132544411QQihZ006QQcategoryZ41994QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
That will let you use a standard 40-pin ATA cable and power cable. Just plugging in a 40-pin cable into the 50-pin connector on the back of the drive won't work, as that connector carries power for the drive as well as the ATA signal. It would be possible to hack up something to work... but it'd be far easier just to get one of those adapters.