var theImages = new Array()
var theAltText = new Array()

theImages[0] = 'headerImage1.jpg'
theImages[1] = 'headerImage2.jpg'
theImages[2] = 'headerImage3.jpg'

theAltText[0] = 'Race Night Films - Organise your Race Night Today!'
theAltText[1] = 'Race Night Films - A great way to raise money for your club'
theAltText[2] = 'Race Night Films - Contact Us for a great night\'s entertainment!'

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]+'" width="555" height="274" alt="'+theAltText[whichImage]+'"">');
}
function showImageInside(){
document.write('<img src="../images/'+theImages[whichImage]+'" width="555" height="274" alt="'+theAltText[whichImage]+'"">');
}