carlPics = new Array (
"images/surfer.jpg", 
"images/surfboard.jpg", 
"images/surfer_beach.jpg", 
"images/surfer_walking.jpg");

imgCount = carlPics.length;

function choosePics() {
	
		randomNum = Math.floor((Math.random() * imgCount));
		
		document.navImages.src = carlPics[randomNum];
		

}