function setContrast() {
	if (getActiveStyleSheet()=='' || getActiveStyleSheet()=='contrast') {
		setActiveStyleSheet('verde');
		//alert ("1");
	}
	var c = document.getElementById("contrast");
	// alert (c.className);
	// alert (blContrast);
	if(blContrast){
		blContrast = false;
		c.className = c.className.replace("active","");
	} else {
		blContrast = true;
		c.className = "active";
	}
	
	setActiveStyleSheet(getActiveStyleSheet());
}

function setActiveStyleSheet(title) {
  var i, a, main;
  var aFont = document.getElementById(title);
  var s = document.getElementById("verde");
  var m = document.getElementById("blu");
  var l = document.getElementById("arancio");
  var c = document.getElementById("dark");
  var c = document.getElementById("bianco");
    
  if(aFont != null) {
	  s.className = s.className.replace("active","");
	  m.className = m.className.replace("active","");
	  l.className = l.className.replace("active","");
	  aFont.className = "active";
	  //if(blContrast)c.className = "active";
	  
  }
  
  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(blContrast && a.getAttribute("title") == "contrast") 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;
}

/*
window.onload = function(e) {
  var cookie = readCookie("style");
  var cookie2 = readCookie("styleContrast");
  if(cookie2 == "true") {
    var blContrast = true;
  } else {
	var blContrast = false;
  }
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}
*/

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

var cookie = readCookie("style");
var cookie2 = readCookie("styleContrast");
if(cookie2 == "true") {
	var blContrast = true;
} else {
	var blContrast = false;
}
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
if (title==null) setActiveStyleSheet('verde');