public void upgradeBackpack()
	{

		if (this.game.chestOpen && this.capacity > 1 && this.chestWood >= 5)
		{
			// upgrade backpack 2
			this.capacity = 15;
			this.chestWood -= 5;
			this.chestWood -= 3;
		}
		if (this.game.chestOpen && this.capacity == 1 && this.chestWood >= 5)
		{
			// upgrade backpack
			this.capacity = 5;
			this.chestWood -= 5;
		}

	}