Partition and install second OS?

I currently have windows xp on my hard drive. What i want to do is install a second OS on the same hard drive. I heard i need a pertition but i dont know how to make one. I would really appreciate it if someone could give me DETAILED instructions/websites to get a second operating system installed. After all, i... show more I currently have windows xp on my hard drive. What i want to do is install a second OS on the same hard drive. I heard i need a pertition but i dont know how to make one. I would really appreciate it if someone could give me DETAILED instructions/websites to get a second operating system installed. After all, i dont want to lose my first operating system.
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