var tabLinks = new Array();
var contentDivs = new Array();

function init() {

	// Grab the tab links and content divs from the page
	var tabListItems = document.getElementById('tabs').childNodes;
	for ( var i = 0; i < tabListItems.length; i++ ) {
		if ( tabListItems[i].nodeName == "LI" ) {
			var tabLink = getFirstChildWithTagName( tabListItems[i], 'A' );
			var id = getHash( tabLink.getAttribute('href') );
			tabLinks[id] = tabLink;
			contentDivs[id] = document.getElementById( id );
		}
	}

	// Assign onclick events to the tab links, and
	// highlight the first tab
	var i = 0;

	for ( var id in tabLinks ) {
		tabLinks[id].onclick = showTab;
		tabLinks[id].onfocus = function() { this.blur() };
		if ( i == 0 ) tabLinks[id].className = 'selected';
		i++;
	}

	// Hide all content divs except the first
	var i = 0;

	for ( var id in contentDivs ) {
		if ( i != 0 ) contentDivs[id].className = 'tabContent hide';
		i++;
	}
}

function showTab() {
	var selectedId = getHash( this.getAttribute('href') );

	// Highlight the selected tab, and dim all others.
	// Also show the selected content div, and hide all others.
	for ( var id in contentDivs ) {
		if ( id == selectedId ) {
			tabLinks[id].className = 'selected';
			contentDivs[id].className = 'tabContent';
		} else {
			tabLinks[id].className = '';
			contentDivs[id].className = 'tabContent hide';
		}
	}

	// Stop the browser following the link
	return false;
}

function getFirstChildWithTagName( element, tagName ) {
	for ( var i = 0; i < element.childNodes.length; i++ ) {
		if ( element.childNodes[i].nodeName == tagName ) return element.childNodes[i];
	}
}

function getHash( url ) {
	var hashPos = url.lastIndexOf ( '#' );
	return url.substring( hashPos + 1 );
}