function prepareGallery() {
	if (!document.getElementsByTagName) return false;
	if (!document.getElementById) return false;
	if (!document.getElementById("imagegallery")) return false;
	var gallery = document.getElementById("imagegallery");
	var links = gallery.getElementsByTagName("a");
	var images = gallery.getElementsByTagName("img");
	for (var i=0; i < links.length; i++) {
		links[i].onclick = function() {
			return showPic(this);
			
		}
	}

}

function showPic(whichpic) {
	if (!document.getElementById("placeholder")) return true;
	var source = whichpic.getAttribute("href");
	var placeholder = document.getElementById("placeholder");
	if (placeholder.nodeName != "IMG") return true;
	placeholder.setAttribute("src",source);
	return false;
	}
	
window.onload = prepareGallery;