if ( document.getElementsByTagName )
    if ( eval( "(document.getElementsByTagName( 'link')) ? true : false;") ) {
        function setActiveStyleSheet(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;
        }
        
        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;
        }
        
        window.onload = function(e) {
          var cookie = readCookie("style");
          var title = cookie ? cookie : getPreferredStyleSheet();
          setActiveStyleSheet(title);
        }
        
        window.onunload = function(e) {
          var title = getActiveStyleSheet();
          createCookie("style", title, 365);
        }
        
        var cookie = readCookie("style");
        var title = cookie ? cookie : getPreferredStyleSheet();
        setActiveStyleSheet(title);
    }