// -------------------------------------------------------------------
// Ajax XML Ticker (txt file source)
// Author: Dynamic Drive (http://www.dynamicdrive.com)
// -------------------------------------------------------------------

////////////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 Ajax Ticker Object function
// ajax_ticker(xmlfile, divId, divClass, delay, optionalfadeornot)
// -------------------------------------------------------------------

function ajax_ticker(xmlfile, divId, divClass, delay, fadeornot){
	this.xmlfile=xmlfile //Variable pointing to the local ticker xml file (txt)
	this.tickerid=divId //ID of ticker div to display information
	this.delay=delay //Delay between msg change, in miliseconds.
	this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over ticker (and pause it if it is)
	this.pointer=0
	this.opacitystring=(typeof fadeornot!="undefined")? "width: 100%; filter:progid:DXImageTransform.Microsoft.alpha(opacity=100); -moz-opacity: 1" : ""
	if (this.opacitystring!="") this.delay+=500 //add 1/2 sec to account for fade effect, if enabled
	this.opacitysetting=0.2 //Opacity value when reset. Internal use.
	this.messages=[] //Arrays to hold each message of ticker
	this.ajaxobj=createAjaxObj()
	document.write('<div id="'+divId+'" class="'+divClass+'"><div style="'+this.opacitystring+'">Initializing ticker...</div></div>')
	this.getXMLfile()
}

// -------------------------------------------------------------------
// getXMLfile()- Use Ajax to fetch xml file (txt)
// -------------------------------------------------------------------

ajax_ticker.prototype.getXMLfile=function(){
	if (this.ajaxobj){
		var instanceOfTicker=this
		var url=this.xmlfile+"?bustcache="+new Date().getTime()
		this.ajaxobj.onreadystatechange=function(){instanceOfTicker.initialize()}
		this.ajaxobj.open('GET', url, true)
		this.ajaxobj.send(null)
	}
}

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

ajax_ticker.prototype.initialize=function(){ 
	if (this.ajaxobj.readyState == 4){ //if request of file completed
		if (this.ajaxobj.status==200 || !window.x){ //if request was successful
			this.contentdiv=document.getElementById(this.tickerid).firstChild //div of inner content that holds the messages
			var xmldata=this.ajaxobj.responseText
			this.contentdiv.style.display="none"
			this.contentdiv.innerHTML=xmldata
			if (this.contentdiv.getElementsByTagName("div").length==0){ //if no messages were found
				this.contentdiv.innerHTML="<b>Error</b> fetching remote ticker file!"
				return
			}
			var instanceOfTicker=this
			document.getElementById(this.tickerid).onmouseover=function(){instanceOfTicker.mouseoverBol=1}
			document.getElementById(this.tickerid).onmouseout=function(){instanceOfTicker.mouseoverBol=0}
			//Cycle through XML object and store each message inside array
			for (var i=0; i<this.contentdiv.getElementsByTagName("div").length; i++){
				if (this.contentdiv.getElementsByTagName("div")[i].className=="message")
				this.messages[this.messages.length]=this.contentdiv.getElementsByTagName("div")[i].innerHTML
			}
			this.contentdiv.innerHTML=""
			this.contentdiv.style.display="block"
			this.rotatemsg()
		}
	}
}

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

ajax_ticker.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!
	this.fadetransition("reset") //FADE EFFECT- RESET OPACITY
	this.contentdiv.innerHTML=this.messages[this.pointer]
	this.fadetimer1=setInterval(function(){
		instanceOfTicker.fadetransition('up', 'fadetimer1')}, 100) //FADE EFFECT- PLAY IT
		this.pointer=(this.pointer<this.messages.length-1)? this.pointer+1 : 0
		setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //update container periodically
	}
}

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

ajax_ticker.prototype.fadetransition=function(fadetype, timerid){
	var contentdiv=this.contentdiv
	if (fadetype=="reset")
	this.opacitysetting=0.2
	if (contentdiv.filters && contentdiv.filters[0]){
		if (typeof contentdiv.filters[0].opacity=="number") //IE6+
			contentdiv.filters[0].opacity=this.opacitysetting*100
		else //IE 5.5
			contentdiv.style.filter="alpha(opacity="+this.opacitysetting*100+")"
	}
	else if (typeof contentdiv.style.MozOpacity!="undefined" && this.opacitystring!=""){
		contentdiv.style.MozOpacity=this.opacitysetting
	}
	else
		this.opacitysetting=1
	if (fadetype=="up")
		this.opacitysetting+=0.1
	if (fadetype=="up" && this.opacitysetting>=1)
		clearInterval(this[timerid])
}