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 playlist Object function
// ajax_playlist(divId, divClass, delay, optionalfadeornot, totalset)
// -------------------------------------------------------------------

function ajax_playlist( divId, divClass, delay, fadeornot, totalSet){

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

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

ajax_playlist.prototype.getXMLfile=function(){
	if (this.ajaxobj){
		var instanceOfplaylist=this
		var randNum = Math.floor(Math.random()*this.totalSet+1);
		var url="playlist" + randNum + ".txt"; //Load in a random image
		//alert(url);
		this.ajaxobj.onreadystatechange=function(){instanceOfplaylist.initialize()}
		this.ajaxobj.open('GET', url, true)
		this.ajaxobj.send(null)
	}
}

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

ajax_playlist.prototype.initialize=function(){ 
	if (this.ajaxobj.readyState == 4){ //if request of file completed
	if (this.ajaxobj.status==200 || window.location.href.indexOf("http")==-1){ //if request was successful
	this.contentdiv=document.getElementById(this.playlistid).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 playlist file!"
	return
	}
	var instanceOfplaylist=this
	document.getElementById(this.playlistid).onmouseover=function(){instanceOfplaylist.mouseoverBol=1}
	document.getElementById(this.playlistid).onmouseout=function(){instanceOfplaylist.mouseoverBol=0}
	if (window.attachEvent) //Clean up loose references in IE
	window.attachEvent("onunload", function(){instanceOfplaylist.contentdiv=instanceOfplaylist.ajaxobj=null})
	//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=="gif")
	this.messages[this.messages.length]=this.contentdiv.getElementsByTagName("div")[i].innerHTML
	}
	this.contentdiv.innerHTML=""
	this.contentdiv.style.display="block"
	this.rotatemsg()
	}
	}
}

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

ajax_playlist.prototype.rotatemsg=function(){
var instanceOfplaylist=this
if (this.mouseoverBol==1) //if mouse is currently over playlist, do nothing (pause it)
setTimeout(function(){instanceOfplaylist.rotatemsg()}, 100)
else{ //else, construct item, show and rotate it!
this.contentdiv.innerHTML=this.messages[this.pointer]
if (this.fadeornot == "fade"){
	this.fadetransition("reset") //FADE EFFECT- RESET OPACITY
	this.fadetimer1=setInterval(function(){instanceOfplaylist.fadetransition('up', 'fadetimer1')}, 100) //FADE EFFECT- PLAY IT
}
this.pointer=(this.pointer<this.messages.length-1)? this.pointer+1 : 0
setTimeout(function(){instanceOfplaylist.rotatemsg()}, this.delay) //update container periodically
}
}

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

ajax_playlist.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])
}