var pic=new Array();
	pic[0]="images/photo-bottles01.jpg";
	pic[1]="images/photo-crates.jpg";
	pic[2]="images/photo-interior.jpg";
	pic[3]="images/photo-corks.jpg";

var num=Math.floor(Math.random()*pic.length);

window.onload=function() {
     document.getElementById('randomphoto').src=pic[num];
}