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