var activeStyleSheet = null;
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;
         activeStyleSheet = title;
      }
    }
  }
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("stylesheet") != -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 title = getPreferredStyleSheet();
   if (change_onload){
      var cookie = getUserStyle();
      if (cookie==null || cookie=='null' ){title = getPreferredStyleSheet();}
      else{title = cookie;}
   }else{
   }
   setActiveStyleSheet(title);
}

function getUserStyle(){
   var i, a;
   var cokie = readCookie("style");
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")==cokie)
     return cokie;
   }
   return getPreferredStyleSheet();

}

window.onunload = function(e) {
  createCookie("style", activeStyleSheet, 365);
}