A keydown script not working?

local MyMouse = game.Players.LocalPlayer:GetMouse()

MyMouse.KeyDown:connect(function(key)
if string.lower(key) == "g" and if game.Players.LocalPlayer.PlayerGui.Value==3 then 
script.Parent.Chest.Ball1.Transparency=0
script.Parent.Chest.Ball2.Transparency=0
script.Parent.Chest.Ball3.Transparency=0
script.Parent.Chest.Ball4.Transparency=0
script.Parent.Chest.Ball5.Transparency=0
script.Parent.Chest.Ball6.Transparency=0
script.Parent.Chest.Ball7.Transparency=0
script.Parent.Chest.Ball8.Transparency=0
script.Parent.Chest.Ball9.Transparency=0
script.Parent.Chest.Ball10.Transparency=0
script.Parent.Chest.Ball11.Transparency=0
script.Parent.Chest.Ball12.Transparency=0
script.Parent.Chest.Ball13.Transparency=0
script.Parent.Chest.Ball14.Transparency=0
script.Parent.Chest.Ball15.Transparency=0
script.Parent.Chest.Ball16.Transparency=0
script.Parent.Chest.Ball17.Transparency=0
script.Parent.Chest.Ball18.Transparency=0
script.Parent.Chest.Ball19.Transparency=0
script.Parent.Chest.Ball20.Transparency=0
script.Parent.Chest.Ball21.Transparency=0
script.Parent.Chest.Ball22.Transparency=0
while string.lower(key) == "g" do
wait(1)
end
end
end)

"if string.lower(key) == "g" and if" .. really? the "and" implies you are going to add to the if statement, delete it and see if your script works.

Delete the second if that follows and