var i1 = new Image();
i1.src = 'lightbox/images/btn-do-over.gif';
var i2 = new Image();
i2.src = 'lightbox/images/btn-works-over.gif';
var i2 = new Image();
i2.src = 'lightbox/images/btn-start-over.gif';
var i2 = new Image();
i2.src = 'lightbox/images/btn-start-small-over.gif';

function changeImage(id, src){
	if(document.getElementById){
		document.getElementById(id).src = src;
	}
}