//
// Gruppo di funzioni per variare l'immagine di sfondo della homepage
//

  function Cookie(document, name, hours, path, domain, secure)                           
  {
      this.$document = document;
      this.$name = name;
      if (hours)
          this.$expiration = new Date((new Date()).getTime() + hours*3600000);
      else this.$expiration = null;
      if (path) this.$path = path; else this.$path = null;
      if (domain) this.$domain = domain; else this.$domain = null;
      if (secure) this.$secure = true; else this.$secure = false;
  }
  
  function _Cookie_store()
  {
      var cookieval = "";
      for(var prop in this) {
          if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function')) 
              continue;
          if (cookieval != "") cookieval += '&';
          cookieval += prop + ':' + escape(this[prop]);
      }
      var cookie = this.$name + '=' + cookieval;
      if (this.$expiration)
          cookie += '; expires=' + this.$expiration.toGMTString();
      if (this.$path) cookie += '; path=' + this.$path;
      if (this.$domain) cookie += '; domain=' + this.$domain;
      if (this.$secure) cookie += '; secure';
  
      this.$document.cookie = cookie;
  }
  
  function _Cookie_load()
  {
      var allcookies = this.$document.cookie;
      if (allcookies == "") return false;
      var start = allcookies.indexOf(this.$name + '=');
      if (start == -1) return false; 
      start += this.$name.length + 1;  
      var end = allcookies.indexOf(';', start);
      if (end == -1) end = allcookies.length;
      var cookieval = allcookies.substring(start, end);
      var a = cookieval.split('&');    
      for(var i=0; i < a.length; i++)  
          a[i] = a[i].split(':');
      for(var i = 0; i < a.length; i++) {
          this[a[i][0]] = unescape(a[i][1]);
      }
      return true;
  }
  
  function _Cookie_remove()
  {
      var cookie;
      cookie = this.$name + '=';
      if (this.$path) cookie += '; path=' + this.$path;
      if (this.$domain) cookie += '; domain=' + this.$domain;
      cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT';
  
      this.$document.cookie = cookie;
  }
  
  new Cookie();
  Cookie.prototype.store = _Cookie_store;
  Cookie.prototype.load = _Cookie_load;
  Cookie.prototype.remove = _Cookie_remove;

  var home = new Cookie(document, "foto_home", 24*1);
  		home_popup  = new Cookie(document, "popup_home");
			n_foto = 4;
  
  function do_check_foto() {         
  	if (!home.load()) home.foto="1" 
  	else if(home.foto<n_foto) home.foto++;
  	     else home.foto="1"
          home.store();
  		/*if (!home_popup.load()) { 
  			news(); 
  			home_popup.displayed="1"; 
  			home_popup.store();
  		}*/
  
  }	    
  
  do_check_foto();