function get_random()
{

// Make sure that random()*X) has the correct
// number. The number of images defined below.
var ranNum= Math.floor(Math.random()*15);
return ranNum;
}
var whichImg=get_random();

function show_image() {

// Add your images here.
// Make sure that Array(X) has the number
// of images that you want to include 
// The array starts with 0, so the 10th array is arrray[9]!!

var img=new Array(15)
img[0]="../../images/header_images/planes/f162.jpg";
img[1]="../../images/header_images/planes/f15.jpg";
img[2]="../../images/header_images/planes/a10.jpg";
img[3]="../../images/header_images/planes/a102.jpg";
img[4]="../../images/header_images/planes/f22.jpg";
img[5]="../../images/header_images/planes/thunderbirds.jpg";
img[6]="../../images/header_images/planes/b2.jpg";
img[7]="../../images/header_images/planes/formation.jpg";
img[8]="../../images/header_images/planes/f22_2.jpg";
img[9]="../../images/header_images/planes/f16_3.jpg";
img[10]="../../images/header_images/planes/stallite.jpg";
img[11]="../../images/header_images/planes/thunderbirds_2.jpg";
img[12]="../../images/header_images/planes/thunderbirds_3.jpg";
img[13]="../../images/header_images/planes/f16_4.jpg";
img[14]="../../images/header_images/planes/f15_2.jpg";




 // Here the actual displaying of the image is taking place.
document.write("<img src='");
document.write(img[whichImg]);
document.write("' border='0' />");
}

show_image();