// START: CSS-alternieren
// ***********************
// nach: Paul Sowden (www.idontsmoke.co.uk/ss/)
// siehe auch: www.alistapart.com/stories/alternate/
    function setActiveStyleSheet(title) {
      if (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;
            }
          }
      }
    }

    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;
    }
// ***********************
// ENDE: CSS-alternieren