var theImages = new Array()

theImages[0] = 'images/banner1.jpg'
theImages[1] = 'images/banner2.jpg'
theImages[2] = 'images/banner3.jpg'
theImages[3] = 'images/banner4.jpg'

var j = 0
var p = theImages.length;

var whichImage = Math.round(Math.random()*(p-1));
document.write('<img src="'+theImages[whichImage]+'" border=0 alt="Dyslexic Hero Productions" />');