if (document.images) {

 learnon = new Image();
 learnon.src = "images/home_learn_on.jpg";

 learnoff = new Image();
 learnoff.src = "images/home_learn_off.jpg";

 enjoyon = new Image();
 enjoyon.src = "images/home_enjoy_on.jpg";

 enjoyoff = new Image();
 enjoyoff.src = "images/home_enjoy_off.jpg";

 shopon = new Image();
 shopon.src = "images/home_shop_on.jpg";

 shopoff = new Image();
 shopoff.src = "images/home_shop_off.jpg";

 }