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


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


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

addLoadEvent(prepareGallery);