BleepingComputer.com: Convert ATA to SATA for a hard drive swap

Okay so here is my problem. I have an old Dell Pentium 4 computer with windows xp. I currently have a 80GB ATA drive in it which is too small for what I need. I had a different computer that I was using for graphic design but the motherboard went bad. Anyway I had to downgrade to the Pentium 4 because I can't afford to buy another high tech computer. Before my motherboard went bad on the high tech computer- I bought a 500 GB SATA hard drive. I would like to put this SATA hard drive into the Pentium 4 PC. However the P4 only has connectors for an ATA drive. What exact cable would I need to do this? If someone could provide a link from newegg or some place where I could purchase this cable that would be great :-p I tried doing a Google search and I became confused at all the cables offered out there. What do you guys suggest? Thanks for your help.

There is no "cable" to convert one to another.

2 options, a SATA/IDE adapter http://www.newegg.com/Product/Product.aspx?Item=N82E16812270269 or a SATA PCI card http://www.newegg.com/Product/Product.aspx?Item=N82E16815283032

Personally, I go for the SATA card since it will let your drive perform better. Conversely, the adapter that plugs into the drive is simpler, but at the expense of speed and sometimes compatability.

Thank you so much for your help!!