Not sure if this is the right forum to post in but here goes

i have 2 harddrives

hard drive A contains my Linux OS (rh8)
hard drive B contains Windows XP home

my problem is when im on a linux bootscreen is there any way i can get an option to boot to the windows harddrive instead of the linux one and vice versa. Because my only option on the boot screen is linux

help me im a newb