You will need to add a controller card in one of your PCI slots.
click here This is one from Watford Electronics. Spec below.
'Satisfy your system's need for speed by adding four ports with data transfer rates up to 133 MB/sec. Working with your existing motherboard, this PCI card enables you to connect up to four additional IDE devices to your system including hard drives, CD-ROMs, tape back-ups, and most other UDMA 133/100/66/33 or ATAPI devices. The "auto-identity" feature provides instant recognition for fast and hassle-free set-up. Advanced CRC error correction improves high-speed data transfers, and dual independent channel PCI IDE bus master controllers offer years of reliable data throughput. To install, simply plug your card into an empty PCI slot and follow the steps in the user-friendly installation guide.'