// JavaScript Document
var Images = new Array()

Images[0] = 'Imagens/img_topo/filialcampogrande.jpg'
Images[1] = 'Imagens/img_topo/matrizdacasa.jpg'

var j = 0
var p = Images.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = Images[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+Images[whichImage]+'">');
}