function removeWhitespace(node) 
{
	var loopIndex;
	
	for (loopIndex = 0; loopIndex < node.childNodes.length; 
	  loopIndex++) {
	
	  var currentNode = node.childNodes[loopIndex];
	
	  if (currentNode.nodeType == 1) {
		removeWhitespace(currentNode);
	  }
	
	  if (((/^\s+$/.test(currentNode.nodeValue))) &&   
		(currentNode.nodeType == 3)) {
		  node.removeChild(node.childNodes[loopIndex--]);
	  }
	}
}


function loopUp(node)
{
	if(node.nodeName == 'UL')
	{
		node.style.display = 'block';
		if(node.previousSibling != null)
		{
			if(node.previousSibling.nodeName == 'A')
			{
				node.previousSibling.id = 'lefthavon';
			}
		}
		if(node.parentNode.parentNode.nodeName == 'UL')
		{
			loopUp(node.parentNode.parentNode);
		}
	}
}

function testforUL_Up(node)
{
	for(var i=0; i<node.length; i++)
	{
		var test = node[i].parentNode.parentNode;  //should be the parent ul
		loopUp(test);
	}
}

function testforUL(node)
{
	for(var i=0; i<node.length; i++)
	{
		var test = node[i].parentNode.getElementsByTagName('ul');
		if(test.length != 0)
		{
			test[0].style.display = 'block';
		}
	}
}

function init_lhn()
{
	var lhn_wrap = $('lhnav');
	removeWhitespace(lhn_wrap);
	
	var alinks = lhn_wrap.getElementsByTagName('a');

	//find the a with id's
	var aOn = new Array();
	for(var i=0; i<alinks.length; i++)
	{
		if(alinks[i].id != '')
		{
			aOn.push(alinks[i]);
		}
	}

	//test if parent nav
	testforUL(aOn);
	testforUL_Up(aOn);
}

function getXMLValue(xmlNode)
{
	return xmlNode.firstChild.nodeValue;
}

function parseXML(xmlnode){
	var itemList = xmlnode.getElementsByTagName('item');
	//var to = note[0].getElementsByTagName('to');
	//alert(getXMLValue(to[0]));
	if(itemList.length > 2)
	{
		var noofitems = 2;	
	}	
	else
	{
		var noofitems = itemList.length;	
	}
	var newsContainer = $('news_wrapper');
	newsContainer.innerHTML = '';
	for(var i=0; i<2; i++)
	{

		var newsItem = document.createElement('div');
		newsItem.className = 'homepage_item';
		
		var newsTitle = document.createElement('div');
		newsTitle.className = 'homepage_item_title';
		var newsTitleLink = document.createElement('a');
		newsTitleLink.innerHTML = getXMLValue(itemList[i].getElementsByTagName('title')[0]);
		newsTitleLink.setAttribute('href',getXMLValue(itemList[i].getElementsByTagName('link')[0]));
		
		newsTitle.appendChild(newsTitleLink);
		
		newsItem.appendChild(newsTitle);
		
		var description = document.createElement('div');
		description.innerHTML = '<p>' + getXMLValue(itemList[i].getElementsByTagName('description')[0]) + '</p>';
		
		newsItem.appendChild(description);
		
		var moreLink = document.createElement('div');
		moreLink.style.textAlign = 'right';
		
		var theLink = document.createElement('a');
		theLink.innerHTML =  'More > >';
		theLink.style.cursor = 'pointer';
		theLink.id = 'morelink';
		theLink.setAttribute('href',getXMLValue(itemList[i].getElementsByTagName('link')[0]));
		moreLink.appendChild(theLink);
		
		
		newsItem.appendChild(moreLink);
		
		newsContainer.appendChild(newsItem);
	}
	
}


function getNews(url)
{

	var source = '/gradstudy/uicomponents/xml_php.php?file=' + encodeURIComponent(url);
	new Ajax.Request(source, 
		{   
			method: 'get',   
			onSuccess: function(response) 
			{          
				//alert(response.responseText);
				parseXML(Try.these(
					function() { return new DOMParser().parseFromString(response.responseText, "text/xml"); },
					function() { var xmldom = new ActiveXObject("Microsoft.XMLDOM"); xmldom.loadXML(response.responseText); return xmldom; }
					));
				},

			onFailure: function()
				{ 
					alert('Something went wrong...') 
				}   
		});

}

function turnonmarker(index)
{
	var imgs = $('controls').getElementsByTagName('img');
	for(var i=0; i<imgs.length; i++)
	{
		imgs[i].src = imgs[i].src.replace('bulleton.gif','bulletoff.gif');
	}
	imgs[index].src = imgs[index].src.replace('bulletoff.gif','bulleton.gif'); 
}
/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.3
 * @dependencies prototype.js 1.5.1+, effects.js
 */

/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */

Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
	initialize: function(wrapper, options){
	    this.scrolling  = false;
	    this.wrapper    = $(wrapper);
	    this.scroller   = this.wrapper.down('div.scroller');
	    this.sections   = this.wrapper.getElementsBySelector('div.section');
	    this.options    = Object.extend({ duration: 1.0, frequency: 3 }, options || {});

	    this.sections.each( function(section, index) {
	      section._index = index;
	    });    

	    this.events = {
	      click: this.click.bind(this)
	    };

	    this.addObservers();
			if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration });  // initialSection should be the id of the section you want to show up on load
			if(this.options.autoGlide) this.start();
	  },
	
  addObservers: function() {
    var controls = this.wrapper.getElementsBySelector('div.controls a');
    controls.invoke('observe', 'click', this.events.click);
  },	

  click: function(event) {
		this.stop();
    var element = Event.findElement(event, 'a');
    if (this.scrolling) this.scrolling.cancel();
    
    this.moveTo(element.href.split("#")[1], this.scroller, { duration:this.options.duration });     
    Event.stop(event);
  },

	moveTo: function(element, container, options){
			
			this.current = $(element);

			Position.prepare();
	    var containerOffset = Position.cumulativeOffset(container),
	     elementOffset = Position.cumulativeOffset($(element));

		  this.scrolling 	= new Effect.SmoothScroll(container, 
				{duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
		 turnonmarker(this.current._index);
		  return false;
		},
		
  next: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
    } else var nextIndex = 1;

    this.moveTo(this.sections[nextIndex], this.scroller, { 
      duration: this.options.duration
    });
  },
	
  previous: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : 
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;
    
    this.moveTo(this.sections[prevIndex], this.scroller, { 
      duration: this.options.duration
    });
  },

	stop: function()
	{
		clearTimeout(this.timer);
	},
	
	start: function()
	{
		this.periodicallyUpdate();
	},
		
	periodicallyUpdate: function()
	{ 

		if (this.timer != null) {
			clearTimeout(this.timer);
			this.next();
		}
		this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
	}

});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
  initialize: function(element) {
    this.element = $(element);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'absolute'
    } , arguments[1] || {}  );
    this.start(options);
  },
  setup: function() {
    if (this.options.continuous && !this.element._ext ) {
      this.element.cleanWhitespace();
      this.element._ext=true;
      this.element.appendChild(this.element.firstChild);
    }
   
    this.originalLeft=this.element.scrollLeft;
    this.originalTop=this.element.scrollTop;
   
    if(this.options.mode == 'absolute') {
      this.options.x -= this.originalLeft;
      this.options.y -= this.originalTop;
    } 
  },
  update: function(position) {   
    this.element.scrollLeft = this.options.x * position + this.originalLeft;
    this.element.scrollTop  = this.options.y * position + this.originalTop;
  }
});

function setup10reasons()
{
	mainbanner = new Glider('mainbanner', {duration:0.5});
	mainbannertimer = setInterval ( "mainbanner.next()", 5000 );
	$('mainbanner').onmouseover = function (e)
	{
		if (!e) var e = window.event;
		clearTimeout(mainbannertimer);
	}		
	if ($('mainbanner').captureEvents) $('mainbanner').captureEvents(Event.ONMOUSEOVER);
	
	$('mainbanner').onmouseout = function (e)
	{
		if (!e) var e = window.event;
		mainbannertimer = setInterval ( "mainbanner.next()", 5000 );
	}		
	if ($('mainbanner').captureEvents) $('mainbanner').captureEvents(Event.ONMOUSEOUT);
}

var mainbanner = null;
var mainbannertimer = null;