if (document.images) {

// torre small passief
var torre01_off = new Image();
torre01_off.src = "images/torre/torre01_small_off.jpg"

// torre small actief
var torre01_on = new Image();
torre01_on.src = "images/torre/torre01_small_on.jpg"

// torre big
var torre00_big = new Image();
torre00_big.src = "images/torre/torre00_big.jpg"

}