How do I edit GRUB menu

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http://askubuntu.com – I have a dual boot on my computer of Windows 7 and Xubuntu 12.10. The Linux boot is 1st and the Windows 2nd. I would like to reverse the boot order in the GRUB menu. I need to know the steps to go about editing GRUB.I do most of my work on Windows and need it to be 1st so I can boot up and not watch it. (HowTos)