function setActiveStyleSheet(title) {
  var i, a, main;
  /* getElementsByTagName("link"): Das heißt, es dürfen keine anderen Link-Tags zuvor in der Seite sein!!! */
  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;
    }
  }
  createCookie("style", title, 365);
}

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=/;"; 
}