function randomOrder() {
    return (Math.round(Math.random())-0.5); 
}

rotator_count = 3;

car_images = new Array("images/homepic1.jpg",
		       "images/homepic2.jpg",
		       "images/homepic3.jpg",
		       "images/homepic4.jpg");
car_images.sort( randomOrder );

rotator_images = "";

for (i=0; i < rotator_count; i++) {
    rotator_images += '<a href="#"><img src="' + car_images[i] + '" width=463 height=318 alt="" border="0" /></a>';
}

document.getElementById('rotator').innerHTML = rotator_images;