//
// MENU TABS
// http://www.elated.com/articles/javascript-tabs/

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;
}
// Returns the first child of a specified element that matches a specified tag name. init() calls this function to retrieve the a (link) element inside each list item in the tabs list.
function getFirstChildWithTagName( element, tagName ) {
	for ( var i = 0; i < element.childNodes.length; i++ ) {
		if ( element.childNodes[i].nodeName == tagName ) return element.childNodes[i];
	}
}

// Returns the portion of a URL after any hash symbol. Used by init() and showTab() to extract the content div ID referenced in a tab link.
function getHash( url ) {
	var hashPos = url.lastIndexOf ( '#' );
	return url.substring( hashPos + 1 );
}

window.onload = function() {

	init();

}

//