// -------------------------------------------------------------------
// Advanced RSS Ticker (Ajax invocation) core file
// Author: Dynamic Drive (http://www.dynamicdrive.com)
// -------------------------------------------------------------------

//Relative URL syntax:
var lastrssbridgeurl="rss.aspx"

//Absolute URL syntax. Uncomment below line if you wish to use an absolute reference:
//var lastrssbridgeurl="http://"+window.location.hostname+"/lastrss/bridge.php"

////////////No need to edit beyond here//////////////

function createAjaxObj()
{
	var httprequest = false
	if (window.XMLHttpRequest)
	{ // if Mozilla, Safari etc
		httprequest = new XMLHttpRequest()
		if (httprequest.overrideMimeType)
			httprequest.overrideMimeType('text/xml')
	}
	else if (window.ActiveXObject)
	{ // if IE
		try
		{
			httprequest = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e){
		try
		{
			httprequest = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch (e){}
		}
	}
	return httprequest
}

// -------------------------------------------------------------------
// Main RSS Ticker Object function
// rssticker_ajax(RSS_id, cachetime, divId, divClass, delay, optionallogicswitch)
// -------------------------------------------------------------------

function rssticker_ajax(divId, divClass, delay, logicswitch, src, resetopacity)
{
	lastrssbridgeurl = src
	this.tickerid = divId // ID of ticker div to display information
	this.delay = delay // Delay between msg change, in miliseconds.
	this.logicswitch = (typeof logicswitch!="undefined")? logicswitch : ""
	this.mouseoverBol = 0 // Boolean to indicate whether mouse is currently over ticker (and pause it if it is)
	this.pointer = 0
	this.opacitysetting = resetopacity // Opacity value when reset. Internal use.
	this.resetopacity = resetopacity
	this.title = [], this.link = [], this.description = [], this.pubdate = [] // Arrays to hold each component of an RSS item
	this.ajaxobj = createAjaxObj()
	document.write('<div id="' + divId + '" class="' + divClass + '" >Initializing feed...</div>')
	if (window.getComputedStyle) // detect if moz-opacity is defined in external CSS for specified class
		this.mozopacityisdefined = (window.getComputedStyle(document.getElementById(this.tickerid), "").getPropertyValue("-moz-opacity")==1)? 0 : 1
	this.getAjaxcontent()
}

// -------------------------------------------------------------------
// getAjaxcontent()- Makes asynchronous GET request to the specified rss feed
// -------------------------------------------------------------------

rssticker_ajax.prototype.getAjaxcontent=function()
{
	if (this.ajaxobj)
	{
		var instanceOfTicker=this
		this.ajaxobj.onreadystatechange = function(){instanceOfTicker.initialize()}
		this.ajaxobj.open('GET', lastrssbridgeurl, true)
		this.ajaxobj.send(null)
	}
}

// -------------------------------------------------------------------
// initialize()- Initialize ticker method.
// -Gets contents of RSS content and parse it using JavaScript DOM methods 
// -------------------------------------------------------------------

rssticker_ajax.prototype.initialize = function()
{ 
	if (this.ajaxobj.readyState == 4)
	{ //if request of file completed
		if (this.ajaxobj.status == 200)
		{ //if request was successful
			var xmldata = this.ajaxobj.responseXML
			if (xmldata.getElementsByTagName("item").length == 0)
			{ //if no <item> elements found in returned content
				document.getElementById(this.tickerid).innerHTML = xmldata.getElementsByTagName("channel")[0] + this.ajaxobj.responseText//"<b>Error</b> fetching remote RSS feed!<br />" + this.ajaxobj.responseText
				return
			}
			var instanceOfTicker = this
			this.feeditems = xmldata.getElementsByTagName("item")
			//Cycle through RSS XML object and store each peice of an item inside a corresponding array
			for (var i = 0; i < this.feeditems.length; i++)
			{
				this.title[i] = this.feeditems[i].getElementsByTagName("title")[0].firstChild.nodeValue
				this.link[i] = this.feeditems[i].getElementsByTagName("link")[0].firstChild.nodeValue
				var descriptionTag = this.feeditems[i].getElementsByTagName("description")[0].firstChild;
				if (descriptionTag != null)
				{
					this.description[i] = descriptionTag.nodeValue
				}
				else
				{
					this.description[i] = "";
				}
				this.pubdate[i] = this.feeditems[i].getElementsByTagName("pubDate")[0].firstChild.nodeValue
			}
			document.getElementById(this.tickerid).onmouseover = function(){instanceOfTicker.mouseoverBol=1}
			document.getElementById(this.tickerid).onmouseout = function(){instanceOfTicker.mouseoverBol=0}
			this.rotatemsg()
		}
	}
}

// -------------------------------------------------------------------
// rotatemsg()- Rotate through RSS messages and displays them
// -------------------------------------------------------------------

rssticker_ajax.prototype.rotatemsg = function()
{
	var instanceOfTicker = this
	if (this.mouseoverBol == 1) //if mouse is currently over ticker, do nothing (pause it)
		setTimeout(function(){instanceOfTicker.rotatemsg()}, 100)
	else
	{ //else, construct item, show and rotate it!
		var tickerDiv = document.getElementById(this.tickerid)
		var linktitle = '<div class="rsstitle"><a class="newsheadline" href="' + this.link[this.pointer] + '">' + this.title[this.pointer] + '</a></div>'
		var description = '<div class="rssdescription">' + this.description[this.pointer] + '</div>'
		var feeddate = '<div class="rssdate">' + this.pubdate[this.pointer] + '</div>'
		if (this.logicswitch.indexOf("description") == -1)
			description = ""
		if (this.logicswitch.indexOf("date") == -1)
			feeddate = ""
		var tickercontent = linktitle + feeddate + description //STRING FOR FEED CONTENTS 
		this.fadetransition("reset") //FADE EFFECT- RESET OPACITY
		tickerDiv.innerHTML = tickercontent
		this.fadetimer1 = setInterval(function(){instanceOfTicker.fadetransition('up', 'fadetimer1')}, 100) //FADE EFFECT- PLAY IT
		this.pointer = (this.pointer < this.feeditems.length - 1) ? this.pointer + 1 : 0
		setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //update container every second
	}
}

// -------------------------------------------------------------------
// fadetransition()- cross browser fade method for IE5.5+ and Mozilla/Firefox
// -------------------------------------------------------------------

rssticker_ajax.prototype.fadetransition = function(fadetype, timerid)
{
	var tickerDiv = document.getElementById(this.tickerid)
	if (fadetype == "reset")
		this.opacitysetting = this.resetopacity
	if (tickerDiv.filters && tickerDiv.filters[0])
	{
		if (typeof tickerDiv.filters[0].opacity == "number") //IE6+
			tickerDiv.filters[0].opacity = this.opacitysetting * 100
		else //IE 5.5
			tickerDiv.style.filter = "alpha(opacity=" + this.opacitysetting * 100 + ")"
	}
	else if (typeof tickerDiv.style.MozOpacity != "undefined" && this.mozopacityisdefined)
	{
		tickerDiv.style.MozOpacity = this.opacitysetting
	}
	if (fadetype == "up")
		this.opacitysetting += this.resetopacity
	if (fadetype == "up" && this.opacitysetting >= 1)
		clearInterval(this[timerid])
}