Anyone have a idea for a macro or how to write a simple addon to heal the tank in the LFG system.

Example--
I run with 4 shammies, and LFG and join with a random tank.. if i do this all day, it takes forever to go and change /target "tanks name" on all 4 characters for each heroic..

Is there a macro function or addon that will just always target the tank in the LFG system? I tried just changing to /target on the main and /assist on the alts but its to slow.. meaning the first heal they will heal there old target, then target who the main is targeting.. and heal

Prolly should just go to isboxer/healbot to skip all of this