var cookie_name = "sidebarsections";
var default_sections = ["2ch", "iichan", "ochan", "sengie", "adult"];


window.onload = function(e)
{
	var sections = get_sections();
	for(var i=0; i<sections.length; i++) toggle(sections[i]);
}


function toggle(id) 
{
	var e = document.getElementById(id);
	if(!e) return;
	if(e.style.display)
	{
		remove_section(id);
		e.style.display = "";
	}
	else
	{
		add_section(id);
		e.style.display = "none"; 
	}
}


function add_section(id)
{
	var sections = get_sections();
	for (var i = 0; i<sections.length; i++) if (sections[i] == id) return;
	sections.push(id);
	set_sections(sections);	
}


function remove_section(id)
{
	var sections = get_sections();
	var new_sections = new Array();
	for (var i=0; i<sections.length; i++) if (sections[i] != id) new_sections.push(sections[i]);
	set_sections(new_sections);	
}


function get_sections()
{
	var cookie = get_cookie(cookie_name);
	if (cookie) return cookie.split(/,/);
	else return default_sections;
}


function set_sections(sections) 
{ 
	set_cookie(cookie_name, sections.join(","), 365); 
}


function get_cookie(name)
{
	with(document.cookie)
	{
		var index = indexOf(name + "=");
		if (index == -1) return '';
		index = indexOf("=", index) + 1;
		var endstr = indexOf(";", index);
		if (endstr == -1) endstr = length;
		return unescape(substring(index, endstr));
	}
}


function set_cookie(name, value, days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime() + (days * 24* 60 * 60 * 1000));
		var expires = "; expires=" + date.toGMTString();
	}
	else expires = "";
	document.cookie = name + "=" + value + expires + "; path=/";
}