/* 
$Id: styleswitcher.js 467 2004-08-23 17:06:44Z joe $
script taken from http://www.alistapart.com/articles/alternate/ 
and enriched by Joachim Schlosser
*/
function setActiveStyleSheet(title) {
  var i, a, main;
  if (document.layers) {
    alert('Leider kann der Netscape <=4.x  den Darstellungsstil nicht ändern.\nWie wäre es mit einem neueren Browser?');
  }
  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;
}
/* do not wait until load has finished */
Ergebnis = window.location.search.match(/layout=([^&]*)/);
if (Ergebnis) {
  setActiveStyleSheet(Ergebnis[1]);
 } else {
  var cookie = readCookie("SeitenLayout");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
  window.onunload = function(e) {
    var title = getActiveStyleSheet();
    createCookie("SeitenLayout", title, 2);
  };
 }