//nav roll-over images variable declaration
var homeoff = new Image();homeoff.src = "images/nav/nav_home_off.gif";
var neigoff = new Image();neigoff.src = "images/nav/nav_neig_off.gif";
var photoff = new Image();photoff.src = "images/nav/nav_phot_off.gif";
var mapaoff = new Image();mapaoff.src = "images/nav/nav_mapa_off.gif";
var talkoff = new Image();talkoff.src = "images/nav/nav_talk_off.gif";


var homeon = new Image();homeon.src = "images/nav/nav_home_on.gif";
var neigon = new Image();neigon.src = "images/nav/nav_neig_on.gif";
var photon = new Image();photon.src = "images/nav/nav_phot_on.gif";
var mapaon = new Image();mapaon.src = "images/nav/nav_mapa_on.gif";
var talkon = new Image();talkon.src = "images/nav/nav_talk_on.gif";