function topmenuNav(subs) {
		switch (subs) {
			case "appliance_div": {
				new Effect.Fade('plumbing_div');
				new Effect.Fade('design_div');
				break;
			}
			case "plumbing_div": {
				new Effect.Fade('appliance_div');
				new Effect.Fade('design_div');
				break;
			}
			case "design_div": {
				new Effect.Fade('plumbing_div');
				new Effect.Fade('appliance_div');
				break;
			}
		}
		new Effect.Appear(subs);
	}