function prepareGalPlaceholder() {
  if (!document.createElement) return false;
  if (!document.createTextNode) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("gal")) return false;
  var galplaceholder = document.createElement("img");
  galplaceholder.setAttribute("id","galplaceholder");
  galplaceholder.setAttribute("src","../galrollover.gif");
  galplaceholder.setAttribute("alt","image gallery");
  var gallery = document.getElementById("gal");
  insertAfter(galplaceholder,gallery);
}

function prepareGallery() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("galnav")) return false;
  var gallery = document.getElementById("galnav");
  var links = gallery.getElementsByTagName("a");
  var galplaceholder = document.getElementById("galplaceholder");
  for ( var i=0; i < links.length; i++) {
    links[i].onmouseover = function() {
      return showPic(this);
	}
	links[i].onmouseout = function() {
	  galplaceholder.setAttribute("src","../galrollover.gif");
	}
  }
}

function showPic(whichpic) {
  if (!document.getElementById("galplaceholder")) return true;
  if (whichpic.getAttribute("title")) {
	var title = whichpic.getAttribute("title");
  } else {
	var title = "";
  }
  var source = "sm-" + title;
  var galplaceholder = document.getElementById("galplaceholder");
  galplaceholder.setAttribute("src",source);
}

addLoadEvent(prepareGalPlaceholder);
addLoadEvent(prepareGallery);