Looking for a Macro.

[Jìo]

I've been looking for a macro for my intervene without success tried to checking some macro guides as well but bleh.. Anyways for the macro:
I want a macro that casts intervene on my target IF the target is in my party and otherwise on my focus or a specific player. Asked a knowledgable friend and he wasnt sure but he didnt think it was possible

[Akryn]

/cast [party, nodead][@focus, nodead, party][@INSERTNAMEHERE] intervene

[pelf]

Should probably take the party out of the focus part.

/cast [party,nodead][@focus,help,nodead][@INSERTNAMEHERE] Intervene