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;
    }
  }
}

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 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);
  var elem = document.getElementById("textsize");
  smalllink = document.createElement('a');
  smalllink.setAttribute('href', "javascript:setActiveStyleSheet('Small text');");
  smalllink.setAttribute('title', 'Small text');
  smallimage = document.createElement('img');
  smallimage.setAttribute('src', '/images/text_small.gif');
  smallimage.setAttribute('alt', 'Small text');
  smalllink.appendChild(smallimage);
  mediumlink = document.createElement('a');
  mediumlink.setAttribute('href', "javascript:setActiveStyleSheet('Medium text');");
  mediumlink.setAttribute('title', 'Medium text');
  mediumimage = document.createElement('img');
  mediumimage.setAttribute('src', '/images/text_medium.gif');
  mediumimage.setAttribute('alt', 'Medium text');
  mediumlink.appendChild(mediumimage);
  largelink = document.createElement('a');
  largelink.setAttribute('href', "javascript:setActiveStyleSheet('Large text');");
  largelink.setAttribute('title', 'Large text');
  largeimage = document.createElement('img');
  largeimage.setAttribute('src', '/images/text_large.gif');
  largeimage.setAttribute('alt', 'Large text');
  largelink.appendChild(largeimage);
  elem.appendChild(smalllink);
  elem.appendChild(document.createTextNode(' '));
  elem.appendChild(mediumlink);
  elem.appendChild(document.createTextNode(' '));
  elem.appendChild(largelink);
}

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

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