var globalTitle = "small";
var sizesArray = new Array();

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;
      	globalTitle = title;
      }
    }
  }
}

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;
}

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

function increaseSize()
{
	var pos = indexOf(sizesArray, globalTitle);
	if (pos != sizesArray.length-1)
	{
		++pos;
	}
	
	setActiveStyleSheet(sizesArray[pos]);
	checkBlogueFrame(sizesArray[pos]);
}

function decreaseSize()
{
	var pos = indexOf(sizesArray, globalTitle);
	if (pos != 0)
	{
		--pos;
	}
	
	setActiveStyleSheet(sizesArray[pos]);
	checkBlogueFrame(sizesArray[pos]);
}

function indexOf(arrayToCheck, valueToCheck)
{
	for (var i=0; i<arrayToCheck.length; i++)
	{
		if(arrayToCheck[i] == valueToCheck)
		{
			return i;
		}
	}
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

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

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

function checkBlogueFrame(style) {
	var iframeName = "docList";
	var iframeWin = window.frames[iframeName];
	var iframeEl = document.getElementById? document.getElementById(iframeName): document.all? document.all[iframeName]: null;
	
	if (iframeWin && iframeEl) {
		iframeWin.setActiveStyleSheet(style);
		iframeWin.autoResize();
	}
}