images = new Array(18);

images[0] = "<img src='images/hdr_img1.jpg'";

images[1] = "<img src='images/hdr_img2.jpg'";

images[2] = "<img src='images/hdr_img3.jpg'";

images[3] = "<img src='images/hdr_img4.jpg'";

images[4] = "<img src='images/hdr_img5.jpg'";

images[5] = "<img src='images/hdr_img6.jpg'";

images[6] = "<img src='images/hdr_img7.jpg'";

images[7] = "<img src='images/hdr_img8.jpg'";

images[8] = "<img src='images/hdr_img9.jpg'";

images[9] = "<img src='images/hdr_img10.jpg'";

images[10] = "<img src='images/hdr_img11.jpg'";

images[11] = "<img src='images/hdr_img12.jpg'";

images[12] = "<img src='images/hdr_img13.jpg'";

images[13] = "<img src='images/hdr_img14.jpg'";

images[14] = "<img src='images/hdr_img15.jpg'";

images[15] = "<img src='images/hdr_img16.jpg'";

images[16] = "<img src='images/hdr_img17.jpg'";

images[17] = "<img src='images/hdr_img18.jpg'";

images[18] = "<img src='images/hdr_img19.jpg'";

images[19] = "<img src='images/hdr_img20.jpg'";

images[20] = "<img src='images/hdr_img21.jpg'";

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

document.write(images[index]);