var randomimg = new Array()

randomimg[0] = 'assets/layout/home_img_01.jpg'
randomimg[1] = 'assets/layout/home_img_02.jpg'
randomimg[2] = 'assets/layout/home_img_03.jpg'

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