function setStyleSwitcher(title) {
	var aImages = document.getElementsByTagName('img');
	for (var i = 0; i < aImages.length; i++) {
		if (aImages[i].className == 'switcher') {
			var src,hsrc;
			src = aImages[i].getAttribute('src');
			if(src.lastIndexOf('_o')!=-1) {
				hsrc = src.replace('_o', '');
				aImages[i].setAttribute('src', hsrc);
			}
			aImages[i].onclick = function() {
				setActiveStyleSheet(this.id);
				return false;
			};
			aImages[i].onkeypress = function() {
				setActiveStyleSheet(this.id);
				return false;
			};
			aImages[i].style.cursor = "pointer";
		}
	}
	var switcher = document.getElementById(title);
	var src = switcher.getAttribute('src');
	var ftype = src.substring(src.lastIndexOf('.'), src.length);
	var hsrc = src.replace(ftype, '_o'+ftype);
	switcher.setAttribute('src', hsrc);
}

function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	if(a.getAttribute("title")) a.disabled = true;
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
  setStyleSwitcher(title);
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && 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") && 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 = "";
  str = name+"="+value+expires+"; path=/";
  document.cookie = str;
}

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;
}

addListener(window, 'unload', function() {
	var title = getActiveStyleSheet();
	createCookie("style", title, 365);
});

addListener(window, 'load', function(){
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
});