var theImages = new Array()

theImages[0] = 'top_right_photo.gif'
theImages[1] = 'top_right_photo_02.gif'
theImages[2] = 'top_right_photo_03.gif'
theImages[3] = 'top_right_photo_04.gif'
theImages[4] = 'top_right_photo_05.gif'
theImages[5] = 'top_right_photo_06.gif'

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="/images/'+theImages[whichImage]+'">');
}