function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	try
	{
	    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title"))
		{
	      a.disabled = true;
	      if(a.getAttribute("title") == title) a.disabled = false;
	    }
	}
	catch(ex) {
		//alert('Errore setActiveStyleSheet: ' + ex) 
	}
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	try
	{
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
	}
	catch(ex) 
	{ 
		//alert('Errore getActiveStyleSheet: ' + ex)
	}
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    try
	{
	    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("rel").indexOf("alt") == -1 && a.getAttribute("title")) 
		{
			return a.getAttribute("title");
		}
	}
	catch(ex)
	{ 
		//alert('Errore getPreferredStyleSheet: ' + ex)
	}
  }
  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("styleside");
  var title;
  if ((cookie == null) || (cookie == '') || (cookie == 'null'))
  {
	title = getPreferredStyleSheet();
  }
  else
  {
	title = cookie
  }
  setActiveStyleSheet(title);
}

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

  var cookie = readCookie("styleside");
  var title;
  if ((cookie == null) || (cookie == '') || (cookie == 'null'))
  {
	title = getPreferredStyleSheet();
  }
  else
  {
	title = cookie
  }
  setActiveStyleSheet(title);