// useage is as follows
// <script javascript src="http://www.tw4c.org.uk/trc/random.js"></script>

 rot = new Array(3);

 rot[0] = '<img src="Centre.jpg" border="0" width="383" height="287" alt="Photo of Tom Raine Court">';

 rot[1] = '<img src="Centre1.jpg" border="0" width="383" height="287" alt="Photo of Tom Raine Court">';
 
 rot[2] = '<img src="Centre2.jpg" border="0" width="383" height="287" alt="Photo of Tom Raine Court">';

 index = Math.floor(Math.random() * rot.length);
 document.write(rot[index]);