images = new Array(5);
images[0] = "<img src='images/banner_1.jpg' width='384' height='143' border='0' alt=''>";
images[1] = "<img src='images/banner_5.jpg' width='384' height='143' border='0' alt=''>";
images[2] = "<img src='images/banner_6.jpg' width='384' height='143' border='0' alt=''>";
images[3] = "<img src='images/banner_7.jpg' width='384' height='143' border='0' alt=''>";
images[4] = "<img src='images/banner_8.jpg' width='384' height='143' border='0' alt=''>";
index = Math.floor(Math.random() * images.length);
document.write(images[index]);