var groesse = "1.0";
var keks = "schriftgroesse";
var tage = 30;

function ersetzeSchriftgroesse(p_groesse) {
 var body = document.getElementsByTagName('Body');   
 for(var i=0;i<body.length;i++) {
  body[i].style.fontSize = p_groesse+"em";
 }
}

function switchStyle(s) {
  if (!document.getElementsByTagName) return;
  var el = document.getElementsByTagName("link");
  for (var i = 0; i < el.length; i++ ) {
    if (el[i].getAttribute("rel").indexOf("style") != -1 && el[i].getAttribute("title")) {
      el[i].disabled = true;
      if (el[i].getAttribute("title") == s) el[i].disabled = false;
    }
  }
}

function ladeSchriftgroesse() {
  var c = leseSchriftgroesseCookie();
  if (c && c != groesse) {
    ersetzeSchriftgroesse(c);
    groesse = c;
  }
}

function setzeSchriftgroesse(s) {
  if (s != groesse) {
    ersetzeSchriftgroesse(s);
    groesse = s;
  }
  document.getElementById("SetzeCookie").style.display="block";
}

window.onload = ladeSchriftgroesse;


// Cookie-Funktionen

function setCookie(name, value, expdays) {   // gültig expdays Tage
  var now = new Date();
  var exp = new Date(now.getTime() + (1000*60*60*24*expdays));
  document.cookie = name + "=" + escape(value) + ";" +
                    "expires=" + exp.toGMTString() + ";" +
                    "path=/";
}

function delCookie(name) {   // expires ist abgelaufen
  var now = new Date();
  var exp = new Date(now.getTime() - 1);
  document.cookie = name + "=;" +
                    "expires=" + exp.toGMTString() + ";" + 
                    "path=/";
}

function getCookie(name) {
  var cname = name + "=";
  var dc = document.cookie;
  if (dc.length > 0) {
    var start = dc.indexOf(cname);
    if (start != -1) {
      start += cname.length;
      var stop = dc.indexOf(";", start);
      if (stop == -1) stop = dc.length;
      return unescape(dc.substring(start,stop));
    }
  }
  return null;
}

function setzeSchriftgroesseCookie() {
  setCookie(keks, groesse, tage);
}

function leseSchriftgroesseCookie() {
  return getCookie(keks);
}

function loescheSchriftgroesseCookie() {
  delCookie(keks);
}