// Javascript originally by Paul Snowden and Peter-Paul Koch.
// See http://alistapart.com/articles/alternate/.
// Modifications by mbl.is to support two sets of alternate stylesheets

function setActiveStyleSheet(title,type) {
/*alert('setting active sheet to '+title+'/'+type);*/
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && isStyleSheetType(a.getAttribute("title"),type)) {
/*	  alert(a.getAttribute("title"))*/
      a.disabled = true;
      if(a.getAttribute("title") == title) {
		/*alert('matched '+title+' to '+a.getAttribute("title")+'. Type:'+type);*/
		a.disabled = false;
	  }
    }
  }
}

function isStyleSheetType(str,type) {
  if      (str == "")                             { return true; }
  else if (type != "color" && str.match(/\d/))    { return true; }
  else if (type == "color" && str.match(/^\D*$/)) { return true; }
  return false;
}

function getActiveStyleSheet(type) {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && isStyleSheetType(a.getAttribute("title"),type) && !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,"font");
  cookie = readCookie("cstyle");
  title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title,"color");
}

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

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title,"font");
cookie = readCookie("cstyle");
title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title,"color");