images = new Array(3);
images[0] = "<a href='portfolio/web/juvent.php'><img src='images/sidebar/01.jpg' alt='Juvent Inc'></a>";
images[1] = "<a href='portfolio/web/ianet.php'><img src='images/sidebar/02.jpg' alt='Italian American Network'></a>";
images[2] = "<a href='portfolio/web/italchamber.php'><img src='images/sidebar/03.jpg' alt='Italian American Chamber of Commerce'></a>";

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