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images = new Array(5);

images[0] = "<img src='http://www.northandoverflightacademy.com/images/inner-1.jpg'>";
images[1] = "<img src='http://www.northandoverflightacademy.com/images/inner-2.jpg'>";
images[2] = "<img src='http://www.northandoverflightacademy.com/images/inner-3.jpg'>";
images[3] = "<img src='http://www.northandoverflightacademy.com/images/inner-4.jpg'>";
images[4] = "<img src='http://www.northandoverflightacademy.com/images/inner-5.jpg'>";

index = Math.floor(Math.random() * images.length);
document.write(images[index]);

// -->