Need help with some healing macros

[JackBurton]

Im looking to get help with the syntax and general guidance. Im looking to create a smart macro. I'd like it to cast the macro in this order of priority

Cast on targets target (we are in combat, use it where its most needed)
Cast on Focus (we are out of combat and we want it on a designated toon)
Cast on Tank (we are out of combat and want it on the designated tank)
Cast on Player(self) (we not in the above type of instaport instance and want to cast on the player(priest))

/castsequence reset=combat/10 [target=targettarget,nochanneling] Power Word: Shield, Prayer of Mending, renew
/stopmacro [help,nodead, exists]
/castsequence reset=combat/10 [target=Focus] Power Word: Shield, Prayer of Mending, renew
/stopmacro [@focus,nodead, exists]
/castsequence reset=combat/10 @tank Power Word: Shield, Prayer of Mending, renew
/stopmacro [@tank,help,nodead, exists]
/castsequence reset=combat/10 @player Power Word: Shield, Prayer of Mending, renew

btw i found this great macro to toggle mute. Great for listening to a YouTube Video or Ventrillo when the game gets too loud.
/run local c="Sound_EnableAllSound"SetCVar(c,not GetCVarBool(c)and"1")

I have a nice little combat prep map-key that i use in normal 5 mans that look like this.
step1
/cast [@party1] Power Word: Shield
step2
/cast [@party2] Power Word: Shield
step3
/cast [@party3] Power Word: Shield
step4
/cast [@party4] Power Word: Shield
step5
/cast [@player] Power Word: Shield

um when im in battlegrounds my round Robbin spells don't want to work because my toons are spread out across the whole 40 or so man raid.

how could i combine two macros into one to save wow macro key combination's

/cast [@party1] Power Word: Shield
/cast [target=Magnüs] Power Word: Shield
/script UIErrorsFrame:Clear()