function setCookie(key, value) {
		  var cookieDate = new Date();
		  cookieDate.setTime(cookieDate.getTime() +  (365 * 24 * 60 * 60 * 1000));
		  // document.cookie = key + '=' + escape(value) + '; expires=0; path=/';
		  document.cookie = key + '=' + escape(value) + '; expires=' + cookieDate.toGMTString() + '; path=/';
		  // senza escape dell' url      document.cookie = key + '=' + value + '; expires=' + cookieDate.toGMTString() + '; path=/';
}

function getCookie(key) {
		  var cookie = document.cookie;
		  var first = cookie.indexOf(key+'=');
		  // coockie exists
		  if (first>=0) {
		  	 var str = cookie.substring(first, cookie.length);
			 var last = str.indexOf(';');
			 // if last cookie
			 if (last<0 ) last = str.length;
			 // get cookie value
			 str = str.substring(0,last).split('=');
			 return unescape(str[1]);
		  } else {
		  	//alert('cookie non letto o assente');
		  	return null;
		  }
}
 setCookie('referrer', document.referrer);