Can anyone tell me the resale value of this mountain bike?

its a 16" (mens) gary fischer advance rst that i bought for about 400$ in 2003. it's never been on the trails or in an accident of any kind -- just used it for riding around campus. now that i'd like to get into mnt biking i find the frame is much to large for me to control on such terrain. if anyone can give me an approx resale value that'd be awesome! thanks!