function fontsizeup() {
  active = getActiveStyleSheet();
  switch (active) {
    case 'css/small.css' : 
      setActiveStyleSheet('css/medium.css');
      break;
    case 'css/medium.css' : 
      setActiveStyleSheet('css/large.css');
      break;
    default :
      setActiveStyleSheet('css/large.css');
      break;
  }
}

function fontsizedown() {
  active = getActiveStyleSheet();
  switch (active) {
    case 'css/large.css' : 
      setActiveStyleSheet('css/medium.css');
      break;
    case 'css/medium.css' : 
      setActiveStyleSheet('css/small.css');
      break;
    default :
      setActiveStyleSheet('css/small.css');
      break;
  }
}

function setActiveStyleSheet(ss) {
    $('#alternate-stylesheet').attr('href', ss);
}

function getActiveStyleSheet() {
    return $('#alternate-stylesheet').attr('href');
}

function getPreferredStyleSheet() {
    return "css/small.css";

}

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();
if (title == 'null') {
  title = getPreferredStyleSheet();
}
setActiveStyleSheet(title);