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

function setActiveStyleSheet(title){ //Main stylesheet switcher function. Second parameter if defined causes a random alternate stylesheet (including none) to be enabled
	var i, cacheobj, altsheets=[""];
	if(setActiveStyleSheet.chosen)
		try{
			document.getElementsByTagName('head')[0].removeChild(setActiveStyleSheet.chosen);
		}catch(e){}
	for(i=0; (cacheobj=document.getElementsByTagName("link")[i]); i++) {
		if(cacheobj.getAttribute("rel").toLowerCase()=="alternate stylesheet" && cacheobj.getAttribute("title")) { //if this is an alternate stylesheet with title
			cacheobj.disabled = true
			altsheets.push(cacheobj) //store reference to alt stylesheets inside array
			if(cacheobj.getAttribute("title") == title){ //enable alternate stylesheet with title that matches parameter
				cacheobj.disabled = false //enable chosen style sheet
				setActiveStyleSheet.chosen = document.createElement('link');//cloneNode(false);
				setActiveStyleSheet.chosen.rel = 'stylesheet';
				setActiveStyleSheet.chosen.type = 'text/css';
				if(cacheobj.media)
					setActiveStyleSheet.chosen.media = cacheobj.media;
				setActiveStyleSheet.chosen.href = cacheobj.href;
				document.getElementsByTagName('head')[0].appendChild(setActiveStyleSheet.chosen);
			}
		}
	}
}

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("fontsize");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

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

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