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;
		  createCookie("style", title, 365);
	  }
    }
  }
}

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+"="+encodeURI(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 decodeURI(c.substring(nameEQ.length,c.length));
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  //window.alert("cookie: " + cookie);
  var title;
  if (cookie != null) {
	title = cookie;
	setActiveStyleSheet(title);
  }
	else
		title = getPreferredStyleSheet();
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  //window.alert("outcookie: " + cookie);
  createCookie("style", title, 365);
}

var title = null;
var cookie = readCookie("style");
if(cookie == null) {
	title = getPreferredStyleSheet();
}
else
	title = cookie;
setActiveStyleSheet(title);