images = new Array(3);
images[0] = '<img src="http://www.tnyouthconnections.net/images/banner_message.jpg">';
images[1] = '<img src="http://www.tnyouthconnections.net/images/banner_message2.jpg">';
images[2] = '<img src="http://www.tnyouthconnections.net/images/banner_message3.jpg">';
images[3] = '<img src="http://www.tnyouthconnections.net/images/banner_message4.jpg">';
index = Math.floor(Math.random() * images.length);
document.write(images[index]);