menu_infoon = new Image(); 
menu_infoon.src = "img/menu_info_on.gif";
menu_infooff = new Image(); 
menu_infooff.src = "img/menu_info.gif";

menu_richiesteon = new Image(); 
menu_richiesteon.src = "img/menu_richieste_on.gif";
menu_richiesteoff = new Image(); 
menu_richiesteoff.src = "img/menu_richieste.gif";

menu_linkson = new Image(); 
menu_linkson.src = "img/menu_links_on.gif";
menu_linksoff = new Image(); 
menu_linksoff.src = "img/menu_links.gif";