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;
         }
      }
   }
} // setActiveStyleSheet

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;
} // getActiveStyleSheet

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;
} // getPreferredStyleSheet

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=/";
} // createCookie

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;
} // readCookie

function cssonload(e) {
   var cookie = readCookie("style");
   var title = cookie ? cookie : getPreferredStyleSheet();
   setActiveStyleSheet(title);
} // cssonload

function cssonunload(e) {
   var title = getActiveStyleSheet();
   createCookie("style", title, 365);
} // cssonunload

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

if (window.onload != null) {
   var funcCSS = window.onload;
   window.onload = function() { funcCSS(); cssonload(); }
} else {
   window.onload = cssonload;
}

if (window.onunload != null) {
   var funcCSSU = window.onunload;
   window.onunload = function() { funcCSSU(); cssonunload(); }
} else {
   window.onunload = cssonunload;
}