function setActiveStyleSheet(title)
   {
      var i, a, main;
      for(i = 0; (a = document.getElementsByTagName("link")[i]); i++)
      {
         if(
               a.getAttribute("rel") &&
               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") &&
               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") &&
               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);