var theImages = new Array();

theImages[0] = 'images/header/swap1.jpg';
theImages[1] = 'images/header/swap2.jpg';
theImages[2] = 'images/header/swap3.jpg';
theImages[3] = 'images/header/swap4.jpg';
theImages[4] = 'images/header/swap5.jpg';
theImages[5] = 'images/header/swap6.jpg';
theImages[6] = 'images/header/swap7.jpg';

var whichImage = Math.round(Math.random() * (theImages.length - 1));

document.write('<img src="' + theImages[whichImage] + '" alt="MOORE INSIGHT" />\n');