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;
				changeLabel(title);
			}
		}
	}
}

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;
}

function changeLabel(title) {
	if (document.getElementById('barrierefrei')) {
		if (title == 'barrierefrei') {
			document.getElementById('barrierefrei').innerHTML = 'normale Ansicht';
			document.getElementById('barrierefrei').onclick = function () {
				setActiveStyleSheet('default');
				return false;
			};
		} else {
			document.getElementById('barrierefrei').innerHTML = 'Barrierefrei';
			document.getElementById('barrierefrei').onclick = function () {
				setActiveStyleSheet('barrierefrei');
				return false;
			};
		}
	}
}

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 );
}

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

window.name = 'page';