/*
This code is based on a code example from the article "Javascript navigation - cleaner, not meaner" by Christian Heilmann
URL: http://www.evolt.org/article/Javascript_navigation_cleaner_not_meaner/17/60273/index.html
*/

// If there is enough W3C DOM support for all our show/hide behavior:
// 1. Call the stylesheet that by default hides all toggleable sections 
// 2. Apply the show/hide behavior by calling the initialization function
if (document.getElementById && document.getElementsByTagName && document.createTextNode) {
	document.write('<link rel="stylesheet" type="text/css" href="css/js_hide.css" />');
	//addLoadEvent(initShowHide);
	window.onload = initShowHide;
}

function initShowHide() {
	// Hide all toggleable sections with JavaScript for the highly improbable case that CSS is disabled
	// Note that in this case the 'flash of visible content' still will occur
	// For testing purposes you can add the following code to disable CSS: document.getElementsByTagName('link')[0].disabled = true;			
	hide();
	var toggle = document.getElementById('toggle');
	if(toggle) {
		var as = toggle.getElementsByTagName('a');
		for (var i = 0; i < as.length; i++) {
			as[i].onclick = function() {
				show(this);
				return false;
			}
		}
		// show first element by default
		show(as[0]);
	}
}

function show(s) {
	hide();
	var id = s.href.match(/#(\w.+)/)[1];
	document.getElementById(id).style.display = 'block';
	// Try to get a reference to an element with the id 'active_tab' (a previously active tab header)
 	var oldActive = document.getElementById('active_tab');
	// If this element exists, remove its ID attribute
	if (oldActive) oldActive.removeAttribute('id');
	// set clicked link as id  = active_tab
	s.setAttribute('id', 'active_tab');
	// get all divs inside of element id and display them
	var nested = document.getElementById(id).getElementsByTagName('div');
	for (var i = 0; i < nested.length; i++) {
		nested[i].style.display = 'block';
	}
}

function hide() {
	var tog = document.getElementById('toggleable');
	if (tog) {
		var toggleable = tog.getElementsByTagName('div');
		for (var i = 0; i < toggleable.length; i++) {
			toggleable[i].style.display = 'none';
		}
	}
}