// JavaScript Document

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function insertAfter(newElement,targetElement) {
	var parent = targetElement.parentNode;
	if (parent.lastChild == targetElement) {
		parent.appendChild(newElement);
	} else {
		parent.insertBefore(newElement,targetElement.nextSibling);
	}
}

function preparePlaceholder() {
	if (!document.createElement) return false;
	if (!document.createTextNode) return false;
	if (!document.getElementById) return false;
	if (!document.getElementById("pt_gallery_images")) return false;
	var placeholder = document.createElement("img");
	placeholder.setAttribute("id","placeholder");
	placeholder.setAttribute("width","400");
	placeholder.setAttribute("src","/_images/elements/gallery_placeholder.jpg");
	placeholder.setAttribute("alt","My image gallery.");
	var description = document.createElement("p");
	description.setAttribute("id","description");
	description.setAttribute("style","clear: both;");
	var desctext = document.createTextNode("Select an image from the above photo-strip to see more about that image.");
	description.appendChild(desctext);
	var gallery = document.getElementById("pt_gallery_images");
	insertAfter(placeholder,gallery);
	insertAfter(description,placeholder);
}

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

function showPic(whichPic) {
	if (!document.getElementById("placeholder")) return false;
	var source = whichPic.getAttribute("href");
	var imagename = whichPic.getAttribute("alt");
	var placeholder = document.getElementById("placeholder");
	placeholder.setAttribute("src",source);
	placeholder.setAttribute("alt",imagename);
	if (!document.getElementById("description")) return false;
	if (whichPic.getAttribute("title")) {
		var text = whichPic.getAttribute("title");
	} else {
		var text = "";
	}
	var description = document.getElementById("description");
	if (description.firstChild.nodeType == 3) {
		description.firstChild.nodeValue = text;
	}
	return false;
}

addLoadEvent(preparePlaceholder);
addLoadEvent(prepareGallery);