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 init() {
	var cookie = readCookie('fontsize');
	var cookie2 = readCookie('kontrast');

	/* wenn cookie = "" dann den aktuellen Wert aus dem CSS auslesen und als cookie speichern */
	if(cookie == null || cookie == '' || cookie == 'NaN') {
		var test = document.getElementById('web').style.fontSize;
		createCookie('fontsize',test,2);
	} else {
		document.getElementById('web').style.fontSize = cookie; 
	}
	
	/* Kontrast cookie lesen */
	if(cookie2 == null || cookie2 == '' || cookie2 == 'NaN' || cookie2 == 'off') {
		createCookie('kontrast','off',2);
	} else {
		var linkurl = document.getElementById('barrierfrei_kontrast').href;
		var pos1 = linkurl.indexOf('styles.css');
		var orgurl = linkurl.substring(0,pos1);
		document.getElementById('barrierfrei_kontrast').href = orgurl+"barrierefrei.css";
	}
	
}

function zoomup() {
	var test = document.getElementById('web').style.fontSize;
	var length = test.length;
	if(test.indexOf('px') >= 0) {
		test = test.substring(0,length-2);
	}
	test = parseInt(test)+1;
	createCookie('fontsize',test+"px",2);
	document.getElementById('web').style.fontSize = test+"px"; 
}

function zoomdown() {
	var test = document.getElementById('web').style.fontSize;
	var length = test.length;
	if(test.indexOf('px') >= 0) {
		test = test.substring(0,length-2);
	}
	test = parseInt(test)-1;
	createCookie('fontsize',test+"px",2);
	document.getElementById('web').style.fontSize = test+"px"; 
}

function zoomnormal() {
	createCookie('fontsize',"10px",2);
	document.getElementById('web').style.fontSize = "10px"; 
}

function kontrast () {
	var linkurl = document.getElementById('barrierfrei_kontrast').href;
	
	if(linkurl.indexOf('styles.css') >= 0) {
		var pos1 = linkurl.indexOf('styles.css');
		var orgurl = linkurl.substring(0,pos1);
		document.getElementById('barrierfrei_kontrast').href = orgurl+"barrierefrei.css";
		createCookie('kontrast',"on",2);
		self.location.reload();
	} else {
		var pos1 = linkurl.indexOf('barrierefrei.css');
		var orgurl = linkurl.substring(0,pos1);
		document.getElementById('barrierfrei_kontrast').href = orgurl+"styles.css";
		createCookie('kontrast',"off",2);
		self.location.reload();
	}
}


window.onload = init;