function setActiveStyleSheet(title)
{
	var i, a, main;

	for (i = 0; (a = document.getElementsByTagName('link')[i]); i++)
	{
		if ((a.getAttribute('rel').indexOf('style') != -1) && (a.getAttribute('title')))
		{
			a.disabled = true;

			if (a.getAttribute('title') == title)
				a.disabled = false;
		}
	}
}

function getActiveStyleSheet()
{
	var i, a;

	for (i = 0; (a = document.getElementsByTagName('link')[i]); i++)
		if ((a.getAttribute('rel').indexOf('style') != -1) && (a.getAttribute('title')) && (!a.disabled))
			return a.getAttribute('title');

	return null;
}

function getPreferredStyleSheet()
{
	var i, a;

	for (i = 0; (a = document.getElementsByTagName("link")[i]); i++)
		if ((a.getAttribute('rel').indexOf('style') != -1) && (a.getAttribute('rel').indexOf('alt') == -1) && (a.getAttribute('title')))
			return a.getAttribute('title');

	return null;
}

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('style');
	var title  = (cookie) ? cookie : getPreferredStyleSheet();

	setActiveStyleSheet(title);
}

window.onunload = function(e)
{
	var title = getActiveStyleSheet();

	createCookie('style', title, 365);
}

var cookie = readCookie('style');
var title  = (cookie) ? cookie : getPreferredStyleSheet();