var images = new Array();

images[0] = "000.jpg"; 
images[1] = "001.jpg";
images[2] = "002.jpg";
images[3] = "003.jpg";
images[4] = "004.jpg";
images[5] = "005.jpg";
images[6] = "006.jpg";

var number = images.length;
var increment = Math.floor(Math.random() * number);
var headerChoice = '<img src="/images/thin/'+images[increment]+'" border="0" width="150" height="502">'
document.write(headerChoice) ;