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

function showPic(whichpic) {
    if (!document.getElementById("placeholder")) return true;
    var source = whichpic.getAttribute("href");
    var placeholder = document.getElementById("placeholder");
    placeholder.setAttribute("src",source);
    if (!document.getElementById("description")) return false;
    var text = whichpic.getAttribute("title") ? whichpic.getAttribute("title") : "";
    var description = document.getElementById("description");
    if (description.firstChild.nodeType == 3) {
        description.firstChild.nodeValue = text;
    }
    return false;
}

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");
    for ( var i=0; i < links.length; i++) {
        links[i].onclick = function() {
            return showPic(this);
    }
    links[i].onkeypress = links[i].onclick;
    }
}

function preparePlaceholder() {
    if(!document.createElement) return false;
    if(!document.createTextNode) return false;
    if(!document.getElementById) return false;
    if(!document.getElementById("imagegallery")) return false;
    var placeholder = document.createElement("img");
    placeholder.setAttribute("id","placeholder");
    placeholder.setAttribute("src","images/placeholder.gif");
    placeholder.setAttribute("alt","Gallery Placeholder");
    var description = document.createElement("p");
    description.setAttribute("id","description");
    var desctext = document.createTextNode("Choose an image");
    description.appendChild(desctext);
    var gallery = document.getElementById("imagegallery");
    insertAfter(placeholder,gallery);
    insertAfter(description,placeholder);
}

function img_create(src, alt, title) {
    var img= IEWIN? new Image() : document.createElement('img');
    img.src= src;
    if (alt!=null) img.alt= alt;
    if (title!=null) img.title= title;
    return img;
}

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

addLoadEvent(preparePlaceholder);
addLoadEvent(prepareGallery);