var linkcontainerID = "imagelinks";
var placeholderID = "current_image";

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


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

window.onload = prepareGallery;