var theImages = new Array();

theImages[0]  = 'immagini/home_11.jpg';
theImages[1]  = 'immagini/home_12.jpg';
theImages[2]  = 'immagini/home_13.jpg';
theImages[3]  = 'immagini/home_21.jpg';
theImages[4]  = 'immagini/home_22.jpg';
theImages[5]  = 'immagini/home_23.jpg';
theImages[6]  = 'immagini/home_31.jpg';
theImages[7]  = 'immagini/home_32.jpg';
theImages[8]  = 'immagini/home_33.jpg';

var i = 0;
var p = theImages.length;
var preBuffer = new Array();
for (i = 0; i < p; i++)
{
  preBuffer[i] = new Image();
  preBuffer[i].src = theImages[i];
}