Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When another "Crystal Beast" monster you control is targeted for an attack: You can change the attack target to this card. If this face-up card is destroyed in a Monster Zone, you can place it face-up in your Spell & Trap Zone as a Continuous Spell, instead of sending it to the GY.
--宝玉獣 アンバー・マンモス
--Crystal Beast Amber Mammoth
local s,id=GetID()
function s.initial_effect(c)
	--send replace
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_TO_GRAVE_REDIRECT_CB)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetCondition(s.repcon)
	e1:SetOperation(s.repop)
	c:RegisterEffect(e1)
	--change battle target
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BE_BATTLE_TARGET)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.cbcon)
	e2:SetTarget(s.cbtg)
	e2:SetOperation(s.cbop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_CRYSTAL_BEAST}
function s.repcon(e)
	local c=e:GetHandler()
	return c:IsFaceup() and c:IsLocation(LOCATION_MZONE) and c:IsReason(REASON_DESTROY)
end
function s.repop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local e1=Effect.CreateEffect(c)
	e1:SetCode(EFFECT_CHANGE_TYPE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD&~RESET_TURN_SET)
	e1:SetValue(TYPE_SPELL+TYPE_CONTINUOUS)
	c:RegisterEffect(e1)
	Duel.RaiseEvent(c,EVENT_CUSTOM+CARD_CRYSTAL_TREE,e,0,tp,0,0)
end
function s.cbcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bt=eg:GetFirst()
	return r~=REASON_REPLACE and c~=bt and bt:IsFaceup() and bt:IsSetCard(SET_CRYSTAL_BEAST) and bt:GetControler()==c:GetControler()
end
function s.cbtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetAttacker():GetAttackableTarget():IsContains(e:GetHandler()) end
end
function s.cbop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and not Duel.GetAttacker():IsImmuneToEffect(e) then
		Duel.ChangeAttackTarget(c)
	end
end