var theImages = new Array()


theImages[0] = 'images/feature1.jpg'
theImages[1] = 'images/feature2.jpg'
theImages[2] = 'images/feature3.jpg'
theImages[3] = 'images/feature4.jpg'



var j = 0
var p = theImages.length;

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

var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+theImages[whichImage]+'" width="230" height="385" border="0">');
}