window.onload = function() {
	var photoNo = document.getElementsByClassName('photo');	// class="photo"を配列で取得
	for (var i=0, L=photoNo.length; i<L; i++) {
//	var theURL = photoNo[i].href;
	photoNo[i].onclick = openImg;
	}
}

function openImg() {
	window.open(this.getAttribute('href'),"winName","scrollbars=yes,resizable=yes,width=880,height=680");
	return false;
}