if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=9;
rndimg = new Array("http://www.frankgambale.com/images/fg-header-1.jpg", "http://www.frankgambale.com/images/fg-header-2.jpg", "http://www.frankgambale.com/images/fg-header-3.jpg", "http://www.frankgambale.com/images/fg-header-4.jpg", "http://www.frankgambale.com/images/fg-header-5.jpg", "http://www.frankgambale.com/images/fg-header-6.jpg", "http://www.frankgambale.com/images/fg-header-7.jpg", "http://www.frankgambale.com/images/fg-header-8.jpg", "http://www.frankgambale.com/images/fg-header-9.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("fg_header").style.backgroundImage = "url("+ randomimage +")"; 
}