If you have the original XP serial number which is normally on the base of the machine, you can load XP from any XP disc (yours or borrowed) as long as it is the same version i.e. XPsp1 or XPsp2, then at the appropriate time during installation enter the original serial number. Hope this helps.
My guess is that it will need to be an XP Pro disc. The reason I say this is because I just did a similar job for a friend who had no disk, but had the original serial number. I loaded my XPsp2 Home disk but it would not accept the serial number. Tried again using my sons disc which is XPsp1 and it worked.