function prepareGallery() {
  if (!document.getElementsByTagName){
    return false;
  }

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

function showPic(whichpic) {
  var source = whichpic.getAttribute("href");
  var placeholder = document.getElementById("mainimage");
  placeholder.setAttribute("src", source);
}

function setWidth() {
	var container = document.getElementById("wrapImages");  
	var images = container.getElementsByTagName("img"); 
	var totalWidth = (images.length*110); 
	container.style.width = totalWidth+"px";
	if (document.all) {
		if (totalWidth >= 530)container.style.height = 96+"px";
	}
}