var pNum = 9
var headImages = new Array(
"page_img1.jpg",
"page_img2.jpg",
"page_img3.jpg",
"page_img4.jpg",
"page_img5.jpg",
"page_img6.jpg",
"page_img7.jpg",
"page_img8.jpg",
"page_img9.jpg"
);
var whichImage= Math.round((Math.random()*100)/(pNum/headImages.length-1));
while(whichImage>headImages.length-1){
whichImage= Math.round((Math.random()*100)/(pNum/headImages.length));
}
document.write("<img src='images/page/" + headImages[whichImage] + "' width='760' height='227' border='0' alt='William Bradford CC'>");