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;
	  }
    }
  }
}

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

function increaseSize()
{
	var cookie = readCookie("style");
	var title = null;
	if (cookie != null && cookie!="null")
	{
		title = cookie;
	}
	else
	{
		title = "size3";
	}
	fontSize = title.charAt(4); // 4 is the sizeof "size"
	if (fontSize <= 4)
	{
		fontSize = (fontSize*1) + 1;
	}

	title = "size" + fontSize;

	// set the size
	setActiveStyleSheet(title);

	// save result in a cookie
	createCookie("style", title, 365);
}

function decreaseSize()
{
	
	var cookie = readCookie("style");

	var title = null;
	if (cookie != null  && cookie!="null")
	{
		title = cookie;
	}
	else
	{
		title = "size3";
	}

	fontSize = title.charAt(4); // 4 is the sizeof "size"
	if (fontSize >= 4)
	{
		fontSize = (fontSize*1) - 1;
	}
	
	title = "size" + fontSize;

	// set the size
	setActiveStyleSheet(title);

	// save result in a cookie
	createCookie("style", title, 365);
}

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);
}

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