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

//Relative URL syntax:
var lastrssbridgeurl= SITE_URL + "/library/ticker/bridge.php";

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

//http://www.dynamicdrive.com/dynamicindex17/rsstickerajax/index.htm

////////////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(RSS_id, cachetime, divId, divClass, delay, logicswitch){
	this.RSS_id = RSS_id //Array key indicating which RSS feed to display
	this.cachetime = cachetime //Time to cache feed, in minutes. 0=no cache.
	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 = 0.2 //Opacity value when reset. Internal use.
	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 ticker...</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 "bridge.php" with the supplied parameters
// -------------------------------------------------------------------

rssticker_ajax.prototype.getAjaxcontent = function(){
	if (this.ajaxobj){
		var instanceOfTicker = this
		var parameters = "id=" + encodeURIComponent(this.RSS_id) + "&cachetime=" + this.cachetime + "&bustcache=" + new Date().getTime()
		//document.write(lastrssbridgeurl+"?"+parameters);
		this.ajaxobj.onreadystatechange = function() { instanceOfTicker.initialize() }
		this.ajaxobj.open('GET', lastrssbridgeurl + "?" + parameters, 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 = "<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
				this.description[i] = this.feeditems[i].getElementsByTagName("description")[0].firstChild.nodeValue
				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">'+this.title[this.pointer]+'</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 
		
		var tickercontent = "<a style='color:#7F6756;' href='" + this.link[this.pointer] + "'><strong>" + this.title[this.pointer] + "</strong></a><br />\n<div style='font-size: 9px;padding-bottom: 1px;'>" + this.pubdate[this.pointer] + "</div>" + this.description[this.pointer] + "<br /><a href='" + this.link[this.pointer] + "' style='color:#7F6756;'>Read more</a>";
		
		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=0.2
	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 += 0.2
	if (fadetype == "up" && this.opacitysetting >= 1)
		clearInterval(this[timerid])
}
















// added to improve fading between articles

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}