var first = null;
var second = null;
var link2 = null;
function switch_two(first_sub,second_sub){
	var oldfirst = first;
	var oldsecond = second;
	var oldlink2 = link2;
	link2 = first_sub + "_link";
	
	first = document.getElementById(first_sub);
	first.style.display = "block";
	
	second = document.getElementById(second_sub);
	second.style.display = "block";
	
	link2 = document.getElementById(link2);
	link2.style.fontStyle = "italic";
	link2.style.color = "#666";
	
	if(oldfirst != null && oldfirst != first) {
		oldfirst.style.display = "none";
		oldsecond.style.display = "none";
		oldlink2.style.color = "#00f";
		oldlink2.style.fontStyle = "normal";
	}
}

var main = null;
var link = null;
function switch_one(main_sub){
	var oldmain = main;
	var oldlink = link;
	link = main_sub + "_link";
	
	main = document.getElementById(main_sub);
	main.style.display = "block";
	
	link = document.getElementById(link);
	link.style.fontStyle = "italic";
	link.style.color = "#666";
	
	if(oldmain != null && oldmain != main) {
		oldmain.style.display = "none";
		oldlink.style.color = "#00f";
		oldlink.style.fontStyle = "normal";
	}
}

var sec = null;
function switch_one2(sec_sub){
	var oldsec = sec;
	
	sec = document.getElementById(sec_sub);
	sec.style.display = "block";
	
	if(oldsec != null && oldsec != sec) {
		oldsec.style.display = "none";
	}
}

var button = null;
var layer = null;
function switch_flip(layer_new){
	button = layer_new + "_link";
	
	layer = document.getElementById(layer_new);
	button = document.getElementById(button);
	
	if(layer.style.display != "block") {
		layer.style.display = "block";
		button.style.fontStyle = "italic";
		button.style.color = "#666";
	}
	else {
		layer.style.display = "none";
		button.style.color = "#00f";
		button.style.fontStyle = "normal";
	}
}

function switch_show(layer) {
	button = layer_new + "_link";
	
	layer = document.getElementById(layer);
	button = document.getElementById(button);
	
	layer.style.display = "block";
	button.style.fontStyle = "italic";
	button.style.color = "#666";
	
}