function cambiaImmagine(img,idImg) {
	var imgTd = '<a href="javascript:GroupDelegate(\'img' + idImg + '\')"><img src="images/' + img + '" alt="" border="0"/></a>';


	var subMenu = document.getElementById('prewTdImg');
	subMenu.innerHTML = imgTd;
}

function GroupDelegate(id) {
    var objLink = document.getElementById(id);
    Lightbox.prototype.start(objLink);
}