function DOMCall(name) {
	if (document.layers) 
		return document.layers[name];
	else if (document.all)
		return document.all[name];
	else if (document.getElementById)
		return document.getElementById(name);
}
function showPic (whichpic) {
	DOMCall('placeholder').src = whichpic.href;
	DOMCall('placeholder').alt = whichpic.title;
	DOMCall('imageCaption').innerHTML = whichpic.title;
 	return false;
}


function switchPage(Id) {
  var pagelist = document.getElementById("pagecontainer").getElementsByTagName("div");
  var pagetotal = pagelist.length;
  var nextpageId = Id + 1;
  var prevpageId = Id - 1;

  if (nextpageId > pagetotal)
  {
    document.getElementById("nextimg").onclick = "";
  }
  else
  {
    document.getElementById("nextimg").onclick = function(){ switchPage(nextpageId) };
  }

  if (prevpageId < 1)
  {
    document.getElementById("previmg").onclick = "";
  }
  else
  {
    document.getElementById("previmg").onclick = function(){ switchPage(prevpageId) };
  }

  if ( document.getElementById("page"+Id) == null || document.getElementById("page"+Id) == undefined )
  {}
  else
  {
  if (prevpageId >= 1)
  {DOMCall("page"+prevpageId).className = "hidden";}
  if(nextpageId <= pagetotal)
  {DOMCall("page"+nextpageId).className = "hidden";}
  DOMCall("page"+Id).className = "asdasd";
  }
}