function imagex(){
images = new Array(2);
images[0] = "<img src='images/h_img1.jpg' alt='Central AV' style='display:block'>";
images[1] = "<img src='images/h_img2.jpg' alt='Central AV' style='display:block'>";
index = Math.floor(Math.random() * images.length);
document.write(images[index]);
}