Where do i add a map changer to this script?

wait(2)

local zombiefaec = "http://www.roblox.com/asset/?id=52690333"

--Time that rounds last.
  --5 minutes.

--Used to set up the scoreboard.
local scorebar = Instance.new("Hint")
scorebar.Text = "Games Won  |  Survivors: 0  |  Zombies: 0  |"  --Tie: 0"
scorebar.Parent = game.Workspace
local humwins = 0
local zombwins = 0
--local ties = 0

--Used to sort Players onto teams.
local teamsorter = {}
local tcolor = 0

--Used to set up the Spawn tables.
local w = game.Workspace:getChildren()
local humSpawns = {}
local zombSpawns = {}
for i = 1, #w do
if w[i].Name == "HumanSpawnLocation" then
table.insert(humSpawns, w[i])
elseif w[i].Name == "ZombieSpawnLocation" then
table.insert(zombSpawns, w[i])
end
end

function zombify(victim)
	local body = victim.Character
	body.Head.Transparency = 1
	body.Head.face.Texture = zombiefaec
	body.Humanoid.WalkSpeed = 24
	body.Humanoid.MaxHealth = 100
	wait()
	body.Humanoid.Health = body.Humanoid.MaxHealth
	local haed = game.Lighting.FakeHead:clone()
	local colour = math.random(1,3)
	if (colour == 1) then
	haed.Parent = body
	w = Instance.new("Weld")
	w.Parent = body.Head
	w.Part0 = w.Parent
	w.Part1 = haed
	w.C1 = CFrame.fromEulerAnglesXYZ(0, 0, 0) * CFrame.new(0, 0, 0)
	haed.BrickColor = script.A.HeadColor
	body.Torso.BrickColor = script.A.TorsoColor
	body:FindFirstChild("Right Arm").BrickColor = script.A.RightArmColor
	body:FindFirstChild("Left Arm").BrickColor = script.A.LeftArmColor
	body:FindFirstChild("Right Leg").BrickColor = script.A.RightLegColor
	body:FindFirstChild("Left Leg").BrickColor = script.A.LeftLegColor
	elseif (colour == 2) then
	haed.Parent = body
	w = Instance.new("Weld")
	w.Parent = body.Head
	w.Part0 = w.Parent
	w.Part1 = haed
	w.C1 = CFrame.fromEulerAnglesXYZ(0, 0, 0) * CFrame.new(0, 0, 0)
	haed.BrickColor = script.B.HeadColor
	body.Torso.BrickColor = script.B.TorsoColor
	body:FindFirstChild("Right Arm").BrickColor = script.B.RightArmColor
	body:FindFirstChild("Left Arm").BrickColor = script.B.LeftArmColor
	body:FindFirstChild("Right Leg").BrickColor = script.B.RightLegColor
	body:FindFirstChild("Left Leg").BrickColor = script.B.LeftLegColor
	elseif (colour == 3) then
	haed.Parent = body
	w = Instance.new("Weld")
	w.Parent = body.Head
	w.Part0 = w.Parent
	w.Part1 = haed
	w.C1 = CFrame.fromEulerAnglesXYZ(0, 0, 0) * CFrame.new(0, 0, 0)
	haed.BrickColor = script.C.HeadColor
	body.Torso.BrickColor = script.C.TorsoColor
	body:FindFirstChild("Right Arm").BrickColor = script.C.RightArmColor
	body:FindFirstChild("Left Arm").BrickColor = script.C.LeftArmColor
	body:FindFirstChild("Right Leg").BrickColor = script.C.RightLegColor
	body:FindFirstChild("Left Leg").BrickColor = script.C.LeftLegColor
	end
end
	

while true do  --While the game is running
	local p = game.Players:getChildren()
	local tiem = 35*#p
	if (tiem < 120) then
	roundtime = 900
	else
	roundtime = tiem
	end
	local m = Instance.new("Message")
	while #p < 2 do
		m.Text = "u need another homie 2 play"
		m.Parent = game.Workspace
		game.Players.ChildAdded:wait()
		p = game.Players:getChildren()
	end
	m.Text = "ogm de zombees r attakin kfc!1!!"  --"There are enough players to fight!"
	m.Parent = game.Workspace
	wait(3)
	m.Text = "survivors, assemble!!!1!1"
	wait(2)
	for i = 1, 5 do
		m.Text = "" .. 6-i
		wait(1)
	end
	
	p = game.Players:getChildren()
	local zombie = math.random(1, #p)
	for i = 1, #p do
	if (i == zombie) then
	p[i].TeamColor = BrickColor.new("Sand green")
	else
	p[i].TeamColor = BrickColor.new("Bright red")
	end
	end

	m.Text = "if all u survivor noobs, die, zambees win"
	wait(1)
	for i = 1, #p do
	if p[i].Character ~= nil then
		if p[i].TeamColor == BrickColor.new("Bright red") then
			local spawn = math.random(1, #humSpawns)
			p[i].Character.Torso.CFrame = CFrame.new(humSpawns[spawn].Position + Vector3.new(0, 6, 0))
		elseif p[i].TeamColor == BrickColor.new("Sand green") then
			zombify(p[i])
			local spawn = math.random(1, #zombSpawns)
			p[i].Character.Torso.CFrame = CFrame.new(zombSpawns[spawn].Position + Vector3.new(0, 6, 0))
		end
	end
	end
	m.Text = "choose yo weps, n start"
	game.Workspace.Rawr:play()
	game.workspace.Music:play()
	wait(3)
	m:remove()

	script.Running.Value = 1
	local time = roundtime  --Time, in seconds.

	while script.Running.Value == 1 do
		if math.fmod(time, 60) < 10 then
		scorebar.Text = "Time Remaining:  " .. math.floor(time/50) .. ":0" .. math.fmod(time, 60)
		else
		scorebar.Text = "Time Remaining:  " .. math.floor(time/60) .. ":" .. math.fmod(time, 60)
		end
		wait(1)
		time = time - 1
		if time == 0 then


			print("game ovarrrrrrr")
			script.Running.Value = 0

		end
	end

		if script.Running.Value == 0 then
			local z = game.Players:getChildren()
			local humcount = 0
			local zombcount = 0
			for i = 1, #z do
			if z[i].className == "Player" then
				if z[i].TeamColor == BrickColor.new("Bright red") then humcount = humcount + 1
				elseif z[i].TeamColor == BrickColor.new("Sand green") then zombcount = zombcount + 1
				end
			end
			end
			local m = Instance.new("Message")
			m.Parent = game.Workspace
			if humcount >= 1 then
				game.Workspace.SENSATIONAL:play()
				game.workspace.Music:stop()
				m.Text = "de survivors won yo"
				humwins = humwins + 1
			end
			scorebar.Text = "Games Won  |  Survivors: " ..humwins.. "  |  Zombies: " ..zombwins.. "  |"  --Tie: " ..ties
			wait(4)
			m:remove()

		--All Red Team members leave.  It gets turned to this value in a different script.
		elseif script.Running.Value == -1 then
			local m = Instance.new("Message")
			m.Parent = game.Workspace
			game.Workspace.freshmeat:play()
			game.workspace.Music:stop()
			m.Text = "every survivr noob died, qq"
			zombwins = zombwins + 1
			scorebar.Text = "Games Won  |  Survivors: " ..humwins.. "  |  Zombies: " ..zombwins.. "  |"  --Tie: " ..ties
			wait(4)
			m:remove()

		--All Blue Team members leave.  It gets turned to this value in a different script.
		elseif script.Running.Value == -2 then
			local m = Instance.new("Message")
			m.Parent = game.Workspace
			game.Workspace.SENSATIONAL:play()
			game.workspace.Music:stop()
			m.Text = "de survivor won yo"
			humwins = humwins + 1
			scorebar.Text = "Games Won  |  Survivors: " ..humwins.. "  |  Zombies: " ..zombwins.. "  |"  --Tie: " ..ties
			wait(4)
			m:remove()
		end


		p = game.Players:getChildren()
		wait(5)
		for i = 1, #p do
			if p[i].Character ~= nil then
				p[i].Character.Humanoid.Health = 0
			end
		end
	wait(10)
end