(function() {
var imgs = new Array(); var imgcnt = 0; var thisimg = 0;
imgs[imgcnt++] = 'images/side_image_1.jpg';
imgs[imgcnt++] = 'images/side_image_2.jpg';
imgs[imgcnt++] = 'images/side_image_3.jpg';

function rotate() {
if (document.images) {
thisimg++;
if (thisimg >= imgcnt) thisimg = 0;
document.getElementById('rollimg').src = imgs[thisimg];
}
}
setInterval(rotate,5000);
})();