Random target macro

[Aevra]

Dear Boxers,

Last week i transfered to GB EU to join Gimp having alot of fun. Did my best on leveling and reached 72 by now. I'm feeling that the more I heal/play defensive in BGs the better it goes. Because im still a squishy target and fairly easy to kill for lvl 79'ers. Now im looking for a macro or something to target a random target with each toon and start casting chain heals all around me or would it be wiser to heal my mains target? Eitherway is there a way to target randoms? i use grid tm and im doing fine but still i would like to try it out sometime.

Thanks for any help in advance,

Greetings,

Xevra