Script working in studio, but not in a game?

I have these in Scripts, and the problem is in the Title. Do I need to change them over to LocalScripts?

local sp = script.Parent
local shirt = sp.Parent.Parent.Parent.Parent.Model:WaitForChild("Shirt")
print 'Found Shirt!'
local value = sp.Parent.Parent.Parent.Parent.Model:WaitForChild("ShirtValue")
print 'Found Value!'

function textureChange()
    shirt.ShirtTemplate = "http://www.roblox.com/asset/?id=169494949"
    value.Value = "169494950"
end
sp.MouseButton1Down:connect(textureChange)