function setActiveStyleSheet(id)
{
	var i, elem, elemi, elems;
	elem = document.getElementById(id);
	elem.disabled = true;
	elem.disabled = false;
	elems = elem.getAttribute("title").split(" ");
	for (i = 0; elems[i]; i++)
	{
		elemi = document.getElementById(elems[i]);
		if (elemi)
			elemi.disabled = true;
	}
}

function setActiveStyleSheets(ids)
{
	var i, id;
	for (i = 0; id = ids[i]; i++)
		setActiveStyleSheet(id);
}

function getActiveStyleSheets()
{
	var i, a, elems, result;
	result = new Array;
	elems = document.getElementsByTagName("link");  
	for (i = 0; a = elems[i]; i++)
		if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("id") && !a.disabled)
			result.push(a.getAttribute("id"));
	return result;
}

function getPreferredStyleSheets()
{
	var i, a, elems, result;
	result = new Array;
	elems = document.getElementsByTagName("link");
	for (i=0; a = elems[i]; i++)
	{
		if (a.getAttribute("rel").indexOf("style") != -1
				&& a.getAttribute("rel").indexOf("alt") == -1
				&& a.getAttribute("id"))
			result.push(a.getAttribute("id"));
	}
	return result;
}

function createCookie(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=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for (var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

window.onload = function(e)
{
	var cookie = readCookie("tabs");
	var ids = cookie ? cookie.split(" ") : getPreferredStyleSheets();
	setActiveStyleSheets(ids);
}

window.onunload = function(e)
{
	var ids = getActiveStyleSheets();
	var cookie = ids.join(" ");
	createCookie("tabs", cookie, 365);
}

var cookie = readCookie("tabs");
var ids = cookie ? cookie.split(" ") : getPreferredStyleSheets();
setActiveStyleSheets(ids);