images = new Array(5);
images[0] = "<img src='images/mainpic-table.jpg' alt='Crosspoint Communications'>";
images[1] = "<img src='images/mainpic-group.jpg' alt='Crosspoint Communications'>";
images[2] = "<img src='images/mainpic-handshake.jpg' alt='Crosspoint Communications'>";
images[3] = "<img src='images/mainpic-toast.jpg' alt='Crosspoint Communications'>";
images[4] = "<img src='images/mainpic-writing.jpg' alt='Crosspoint Communications'>";

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