// This next little bit of code tests whether the user accepts cookies.
var WM_acceptsCookies = false;
if(document.cookie == '') {
    document.cookie = 'WM_acceptsCookies=yes'; // Try to set a cookie.
    if(document.cookie.indexOf('WM_acceptsCookies=yes') != -1) {
	WM_acceptsCookies = true; 
    }// If it succeeds, set variable
} else { // there was already a cookie
  WM_acceptsCookies = true;
}

function contrastchange() {
if(WM_acceptsCookies==false){alert('Per utilizzare questa funzione i cookies devono essere abilitati');}
  myactive = getActiveStyleSheet();
  switch (myactive) {
    case 'A' : 
      setActiveStyleSheet('Contrast');
      break;
    case 'A+' : 
      setActiveStyleSheet('Contrast+');
      break;
    case 'A++' : 
      setActiveStyleSheet('Contrast++');
      break;
    case 'Contrast' : 
      setActiveStyleSheet('A');
      break;
    case 'Contrast+' : 
      setActiveStyleSheet('A+');
      break;
    case 'Contrast++' : 
      setActiveStyleSheet('A++');
      break;						
				default :
      setActiveStyleSheet('Contrast');		
		}		
}
			
function fontsizechange() {
if(WM_acceptsCookies==false){alert('Per utilizzare questa funzione i cookies devono essere abilitati');}
  myactive = getActiveStyleSheet();
  switch (myactive) {
    case 'A' : 
      setActiveStyleSheet('A+');
      break;
    case 'A+' : 
      setActiveStyleSheet('A++');
      break;
    case 'A++' : 
      setActiveStyleSheet('A');
      break;
    case 'Contrast' : 
      setActiveStyleSheet('Contrast+');
      break;
    case 'Contrast+' : 
      setActiveStyleSheet('Contrast++');
      break;
    case 'Contrast++' : 
      setActiveStyleSheet('Contrast');
      break;						
				default :
      setActiveStyleSheet('A');		
		}		
}

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;
}

//window.onload CARICATO IN HEAD ma sembra non servire visto che le ultime tre righe fanno le stesse cose

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

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