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;
    }

    function toggleVis(id, inline)
    {
      if ((elem = document.getElementById(id)) != null) {
        if (elem.style.display != 'none') elem.style.display = 'none';
        else elem.style.display = (inline ? 'inline' : 'block');
      }
    }

    function initVis()  // set initial visibility settings for JS enabled browsers
    {
      toggleVis('imageRatingContent');
      toggleVis('commentContent');
      toggleVis('functions');
      toggleVis('functions');
    }

    function setActiveStyleSheet(title)  // from http://www.alistapart.com/articles/alternate/
    {
      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 initStyle()
    {
      var cookie = readCookie("style");
      var title = cookie ? cookie : getPreferredStyleSheet();
      setActiveStyleSheet(title);
    }

    function setStyleCookie()
    {
      var title = getActiveStyleSheet();
      createCookie("style", title, 365);
    }