I have on old Wal Mart bike (Rhino AL26), aluminum frame and some lower end shimano parts in it, it was actually a decent bike until it was left outside under the porch by my dad. I was wondering if I should toss it out or if I should salvage some parts off it? Being a Wal Mart bike I'm assuming theres not too many parts of value on it, but I've heard about some of them being decent. I have to get to class in a few minutes so I cant snap a picture, here is one I found online. Im sort of new at this, so not sure what to look for, though some of the parts are rusted pretty bad.

http://lp1.pinkbike.org/p4pb3175492/p4pb3175492.jpg