Greetings,
You should be able to accomplish this by editing the following file...
/boot/grub/grug.conf
Grub defaults to the 1st in the list. If you look at mine I boot into redhat 1st..
Boots into Linux 1st...
title Red Hat Linux (2.4.18-26.8.0)
root (hd0,6)
kernel /boot/vmlinuz-2.4.18-26.8.0 ro root=LABEL=/ hdc=ide-scsi
initrd /boot/initrd-2.4.18-26.8.0.img
title Windows XP Professional
rootnoverify (hd0,0)
chainloader +1
Boots into XP 1st...
title Windows XP Professional
rootnoverify (hd0,0)
chainloader +1
title Red Hat Linux (2.4.18-26.8.0)
root (hd0,6)
kernel /boot/vmlinuz-2.4.18-26.8.0 ro root=LABEL=/ hdc=ide-scsi
initrd /boot/initrd-2.4.18-26.8.0.img
Hope this helps...
Kelly