image = new Array(4);
image[0] = '/images/testimonials/quote2.gif';
image[1] = '/images/testimonials/quote3.gif';
image[2] = '/images/testimonials/quote4.gif';
image[3] = '/images/testimonials/quote5.gif';

index = Math.floor(Math.random() * image.length);

document.write("<img src='" +image[index]+ "'>");