/*
  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
  Permission granted to use this code 
  as long as this entire notice is included.
*/

// 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(lnk) 
{
  if (lnk && lnk.blur) lnk.blur(); // remove marquee
  if (!lnk || cur_link == lnk) return;
  if (cur_link) cur_link.className = "done";
  lnk.className = "on";
  cur_link = lnk;
}

var cur_lyr;	// holds id of currently visible layer
function swapLayers(lnk,id) 
{
  doLinkClass(lnk);
  if (cur_lyr) hideLayer(cur_lyr);
  showLayer(id);
  cur_lyr = id;
}

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

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

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

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

function init(id,lyr) 
{
  var lnk = getElemRefs(id);
  swapLayers(lnk,lyr);
}