images = new Array(4);

images[0] = '<a href="http://phet.colorado.edu/new/simulations/sims.php?sim=My_Solar_System" target="_blank"><img src="assets/images/rotating/my-solar-system" /></a><p>My Solar System, a <a href="http://phet.colorado.edu/new/simulations/sims.php?sim=My_Solar_System" target="_blank">gravity simulation</a> from University of Colorado at Boulder. Create your own solar system or choose some presets and watch the fun. Requires Java.</p>';

images[1] = '<a href="#" target="_blank"><img src="assets/images/rotating/fission_demo.jpg" /></a><p><a href="http://phet.colorado.edu/simulations/sims.php?sim=Nuclear_Fission" target="_blank">Shoot neutrons at Uranium</a> to see how fission occurs. You can also set up chain reactions in a nuclear reactor.</p>';

images[2] = '<a href="#" target="_blank"><img src="assets/images/rotating/laser_demo.jpg" /></a><p><a href="http://phet.colorado.edu/simulations/sims.php?sim=Lasers" target="_blank">See how a laser works.</a> You can play around with the energy levels and pumping frequency.</p>';

images[3] = '<a href="#" target="_blank"><img src="assets/images/rotating/projectile_demo.jpg" /></a><p>Launch projectiles (cannonballs, pianos, cars) to hit a target. <a href="http://phet.colorado.edu/simulations/sims.php?sim=Projectile_Motion">Explore projectile motion,</a> including air resistance.</p>';

images[4] = '<a href="http://www.physics.valpo.edu/astronomy/astro_images090213.html" target="_blank"><img src="assets/images/rotating/crab_180w.jpg" /></a><p><a href="http://www.physics.valpo.edu/astronomy/astro_images090213.html">View images of nebulae</a> taken by our remotely-operated SARA Telescope<a href="http://www.physics.valpo.edu/astronomy/astro_images090213.html"></p>';

index = Math.floor(Math.random() * images.length);
document.write(images[index]);
