Inventory

The scipt is suppose to take 1 inventory space if it finds something in the inventory, I have a wooden sword in the inventory but for some reason it does nothing, output shows not errors.

function added(plr)
	repeat wait() until plr.Character;
	local inventory = plr.Backpack;
	x = script.Parent.Frame;
	y = "http://www.roblox.com/asset/?id=";
	used = {
		x.Slot1.IsInUse;
		x.Slot2.IsInUse;
		x.Slot3.IsInUse;
		x.Slot4.IsInUse;
		x.Slot5.IsInUse;
		x.Slot6.IsInUse;
		x.Slot7.IsInUse;
		x.Slot8.IsInUse;
		x.Slot9.IsInUse;
		x.Slot10.IsInUse;
		x.Slot11.IsInUse;
		x.Slot12.IsInUse;
		x.Slot13.IsInUse;
		x.Slot14.IsInUse;
		x.Slot15.IsInUse;
		x.Slot16.IsInUse;
		x.Slot17.IsInUse;
		x.Slot18.IsInUse;
		x.Slot19.IsInUse;
		x.Slot20.IsInUse;
		x.Slot21.IsInUse;
		x.Slot22.IsInUse;
		x.Slot23.IsInUse;
		x.Slot24.IsInUse;
		x.Slot25.IsInUse;
	}
	images = {
		y..129874048;
		y..129874624;
		y..129874448;
		y..137774700;
		y..137804756;
	}
	function InventorySpaces()
		for i, v in pairs(used) do
			for k, j in pairs(inventory:GetChildren()) do
				if v.Value == false and v.Parent.Image == "" then
					v.Value = true;
					if j.Name == "Wooden Sword" then
						v.Parent.Image = images[1];
					elseif j.Name == "Iron Sword" then
						v.Parent.Image = images[2];
					elseif j.Name == "Long Iron Sword" then
						v.Parent.Image = images[3];
					elseif j.Name == "Great Sword" then
						v.Parent.Image = images[4];
					elseif j.Name == "Long Great Sword" then
						v.Parent.Image = images[5];
					end;
					print("Slot is now in use;");
					break;
				else
					print("Slot is already in use");
				end;
			end;
			break;
		end;
	end;
	plr:WaitForChild("Backpack").ChildAdded:connect(InventorySpaces);
end;

game.Players.PlayerAdded:connect(added);