function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function fontsizeup() {
  active = getActiveStyleSheet();
  switch (active) {
    case 'A--' : 
      setActiveStyleSheet('A-');
      break;
    case 'A-' : 
      setActiveStyleSheet('A');
      break;
    case 'A' : 
      setActiveStyleSheet('A+');
      break;
    case 'A+' : 
      setActiveStyleSheet('A++');
      break;
    case 'A++' :
      break;
    default :
      setActiveStyleSheet('A-');
      break;
  }
}

function fontsizedown() {
  active = getActiveStyleSheet();
  switch (active) {
    case 'A++' : 
      setActiveStyleSheet('A+');
      break;
    case 'A+' : 
      setActiveStyleSheet('A');
      break;
    case 'A' : 
      setActiveStyleSheet('A-');
      break;
    case 'A-' : 
      setActiveStyleSheet('A--');
      break;
    case 'A--' : 
       break;
    default :
      setActiveStyleSheet('A--');
      break;
  }
}

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;
      if(a.getAttribute("title") == 'default_style') a.disabled = false;
      if(a.getAttribute("title") == 'text_only') a.disabled = false;
      if(a.getAttribute("title") == 'high_contrast') a.disabled = false;
      
    }
  }
}

function getActiveStyleSheet() 
{
  var i, a;
  for(i=1; (a = document.getElementsByTagName("link")[i]); i++) 
  {	
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled && a.getAttribute("title") != 'default_style' && a.getAttribute("title") != 'text_only' && a.getAttribute("title") != 'high_contrast')
    {
		return a.getAttribute("title");
	}	
  }
  return null;
}

function getPreferredStyleSheet() {
  return ('A--');
}

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;
}

function readstyle() 
{
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

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

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
if (title == 'null') {
  title = getPreferredStyleSheet();
}

function handlers() {
	if (!document.getElementById) return false;
	if (!document.getElementById("fontsizedown")) return false;
	var dn = document.getElementById("fontsizedown");
	dn.onclick = function() {
		fontsizedown();
		return false;
	}
	dn.onkeypressed = function() {
		fontsizeup();
		return false;
	}
	if (!document.getElementById("fontsizeup")) return false;
	var up = document.getElementById("fontsizeup");
	up.onclick = function() {
		fontsizeup();
		return false;
	}
	up.onkeypressed = function() {
		fontsizeup();
		return false;
	}
}

setActiveStyleSheet(title);
EditoStart.Add(readstyle);
EditoStart.Add(handlers);