Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Any Battle Damage you take from battles involving this card is halved.
--フォトン・サークラー
--Photon Circle
local s,id=GetID()
function s.initial_effect(c)
	--Halve damage
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_CHANGE_BATTLE_DAMAGE)
	e1:SetValue(aux.ChangeBattleDamage(0,HALF_DAMAGE))
	c:RegisterEffect(e1)
end