images = new Array(3);

images[0] = "<a href='http://macuathletics.cstv.com'><img src='http://grfx.cstv.com/schoolslt/macu/graphics/macu-07-masthd-left-1.jpg' alt='macu' border='0'></a>";

images[1] = "<a href='http://macuathletics.cstv.com'><img src='http://grfx.cstv.com/schoolslt/macu/graphics/macu-07-masthd-left-2.jpg' alt='macu' border='0'></a>";

images[2] = "<a href='http://macuathletics.cstv.com'><img src='http://grfx.cstv.com/schoolslt/macu/graphics/macu-07-masthd-left-3.jpg' alt='macu' border='0'></a>";

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

document.write(images[index]);