/*************************************************************************
  This code is from Dynamic Web Coding at http://www.dyn-web.com/
  Copyright 2001-3 by Sharon Paine 
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/

// resize fix for ns4
var origWidth, origHeight;
if (document.layers) {
	origWidth = window.innerWidth; origHeight = window.innerHeight;
	window.onresize = function() { if (window.innerWidth != origWidth || window.innerHeight != origHeight) history.go(0); }
}

// link style change
var cur_link;
function doLinkClass(link) {
  if (link && link.blur) link.blur();	// remove marquee
  if (!link || cur_link == link) return;
  if (cur_link) cur_link.className = "done";
  link.className = "on";
  cur_link = link;
}

var cur_layers;	// holds id of currently visible layers
function swaplayers(link,id) {
  doLinkClass(link);
  if (cur_layers) hidelayers(cur_layers);
  showlayers(id);
  cur_layers = id;
}

function showlayers(id) {
  var layers = getElemRefs(id);
  if (layers && layers.css) layers.css.visibility = "visible";
}

function hidelayers(id) {
  var layers = getElemRefs(id);
  if (layers && layers.css) layers.css.visibility = "hidden";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? getlayersRef(id,document): null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}

// get reference to nested layers for ns4
// from old dhtmllib.js by Mike Hall of www.brainjar.com
function getlayersRef(layers,doc) {
	if (document.layers) {
		var thelayers;
		for (var i=0; i<doc.layers.length; i++) {
	  	thelayers = doc.layers[i];
			if (thelayers.name == layers) return thelayers;
			else if (thelayers.document.layers.length > 0) 
	    	if ((thelayers = getlayersRef(layers,thelayers.document)) != null)
					return thelayers;
	  }
		return null;
  }
}

function init(id,layers) {
  var link = getElemRefs(id);
  swaplayers(link,layers);
}