var curStyleIndex = 0;
var styleArray = new Array();
styleArray[0] = "Text small";
styleArray[1] = "Text medium";
styleArray[2] = "Text large";
styleArray[3] = "Text extra-large";


function setActiveStyleSheet(title) {
   var i, a, main;
   if(document.getElementById("text_larger") != null)
   {
	setStyleIndex(title);
   }
   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;
     }
   }
}

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 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 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 setStyleIndex(cookie)
{
	if (cookie.length > 0)
	{
		for (var x=0; x < styleArray.length; x++)
		{
			if (cookie == styleArray[x])
			{
				curStyleIndex = x;
			}
		}
	}
	else
	{
		curStyleIndex = 0;
	}
	checkBoundaries(curStyleIndex);
}

function checkBoundaries(styleIndex) 
{
	
	var textLarge = document.getElementById("text_larger");
	var textSmall = document.getElementById("text_smaller");
	textLarge.className = "";
	textSmall.className = "";
	if (styleIndex >= styleArray.length - 1) textLarge.className = "disabled";//textLarge.setAttribute("class", "disabled");
	else if (parseInt(styleIndex) <= 0) textSmall.className = "disabled";//textSmall.setAttribute("class", "disabled");
}

function doStyle(styleIndex)
{
	
	if (styleIndex >= 0 && styleIndex < styleArray.length)
	{ 	
		setActiveStyleSheet(styleArray[styleIndex]);
	}
	
}

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

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

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