Effect Visible Only to Allies?

[Blackrage]

How do you make effects invisible to enemies, but visible to allies?

+rep to the one who answers.

 

[The Undaddy]

You create an empty string variable ,and then do (in the trigger):

custom script: if IsPlayerAlly(GetLocalPlayer(),[U]Player(0)[/U]) then
set s = "ModelPath"
custom script: endif

Then create the effect with path s.It will be visible only for allies of player 1.
I'll assume you don't know jass and tell you how you can replace Player(0).

Player(0) is player 1
Player(1) is player 2 etc.
GetTriggerPlayer() is triggering player.
GetOwningPlayer(GetTriggerUnit()) is Owner of Triggering unit.