images = new Array(3);
images[0] = '<img src="http://www.signasign.com/images/pic1.jpg" border="0">';
images[1] = '<img src="http://www.signasign.com/images/pic2.jpg" border="0">';
images[2] = '<img src="http://www.signasign.com/images/pic3.jpg" border="0">';
images[3] = '<img src="http://www.signasign.com/images/pic4.jpg" border="0">';
images[4] = '<img src="http://www.signasign.com/images/pic5.jpg" border="0">';
index = Math.floor(Math.random() * images.length);
document.write(images[index]);