var bmImages = new Array(
"about.jpg",
"contact.jpg", 
"default.jpg", 
"edging.jpg",
"engineered.jpg", 
"granite.jpg", 
"marble.jpg", 
"natural.jpg", 
"news.jpg", 
"portfolio.jpg", 
"services.jpg", 
"slate.jpg"
);
var whichImage= Math.round((Math.random()*100)/(12/bmImages.length-1));
while(whichImage>bmImages.length-1){
whichImage= Math.round((Math.random()*100)/(12/bmImages.length));
}
document.write("<img src='/images/page/" + bmImages[whichImage] + "' width='724' height='170' border='0' alt='The Bristol Marble Company Ltd'>");