Warrior Macro helpFollow

A while ago i saw on some forum a macro which seemed helpful at the time i saw it, but i never saved it. Now of course, i can't either find it or remember it. Maybe some of you could help.

Basically what the macro did was, while you are tanking one mob, it switched quickly to an adjacent mob, checking if it was in melee range first, applied a sunder, and then switched back to the original target.

Anyone able to help?