//preload menu sub-pages

var animaloff = new Image();
animaloff.src = "images/content_animals.gif";
var animalon = new Image();
animalon.src = "images/content_animals_on.gif";

var weatheroff = new Image();
weatheroff.src = "images/content_weather.gif";
var weatheron = new Image();
weatheron.src = "images/content_weather_on.gif";

var plantsoff = new Image();
plantsoff.src = "images/content_plants.gif";
var plantson = new Image();
plantson.src = "images/content_plants_on.gif";

var peopleoff = new Image();
peopleoff.src = "images/content_people.gif";
var peopleon = new Image();
peopleon.src = "images/content_people_on.gif";