/*************************************************************************
	  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!
	*************************************************************************/
	
	// onresize 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); }
	}
	
	var cur_content;	// holds id of currently visible layer
	function swapLayers(id) {
<!-- 	  alert (id); -->
	  if (cur_content) hideLayer(cur_content);
	  showLayer(id);
	  cur_content = id;
	}
	
	function showLayer(id) {
	  var content = getElemRefs(id);
	  if (content && content.css) content.css.visibility = "visible";
	}
	
	function hideLayer(id) {
	  var content = getElemRefs(id);
	  if (content && content.css) content.css.visibility = "hidden";
	}
	
	function getElemRefs(id) {
		var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? document.layers[id]: null;
		if (el) el.css = (el.style)? el.style: el;
		return el;
	}