i=new Array('photo-01.jpg', 'photo-02.jpg', 'photo-03.jpg', 'photo-04.jpg', 'photo-05.jpg', 'photo-06.jpg', 'photo-07.jpg');

p=new Array();//preload
for(j=0;j<i.length;j++){p[p.length]=new Image();p[p.length-1].src=i[j];}

function randomImage(id){
	el=document.getElementById(id);
	if (el==null) return;
	el.src = 'graphics/' + i[Math.round(Math.random()*(i.length-1))];
}