Or, in the same file named by jailbait, near the top there is a line that reads 'default 0'. Counting starts with 0 for the first; 1 for the second; and so on. Just count titles down to the xp title entry, and change the default number to that number for the one to boot.
To change the amount of time you have before autoboot, change the timeout line to whatever time (in seconds) you want. If the timeout is zero, grub will not timeout, and will wait until you choose an OS to boot.
Last edited by bigrigdriver; 11-17-2007 at 02:24 PM.