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

function ajax_ticker(xmlfile, divId, divClass, delay, fadeornot){
	this.xmlfile=xmlfile
	this.tickerid=divId
	this.delay=delay
	this.mouseoverBol=0
	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
	this.opacitysetting=0.2
	this.messages=[]
	this.ajaxobj=createAjaxObj()
	document.write('<div id="'+divId+'" class="'+divClass+'"><div style="'+this.opacitystring+'">Initializing scroller...</div></div>')
	this.getXMLfile()
}


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)
	}
}

ajax_ticker.prototype.initialize=function(){ 
	var single = false;
	if (this.ajaxobj.readyState == 4){
		if (this.ajaxobj.status==200 || window.location.href.indexOf("http")==-1){
			this.contentdiv=document.getElementById(this.tickerid).firstChild
			var xmldata=this.ajaxobj.responseText
			this.contentdiv.style.display="none"
			this.contentdiv.innerHTML=xmldata
			if (this.contentdiv.getElementsByTagName("div").length == 1) (single=true);
			if (this.contentdiv.getElementsByTagName("div").length==0){
				this.contentdiv.innerHTML="<b>Fout</b>! Kan het bestand niet ophalen!"
				return
			}
			var instanceOfTicker=this
			document.getElementById(this.tickerid).onmouseover=function(){instanceOfTicker.mouseoverBol=1}
			document.getElementById(this.tickerid).onmouseout=function(){instanceOfTicker.mouseoverBol=0}
			if (window.attachEvent) 
				window.attachEvent("onunload", function(){instanceOfTicker.contentdiv=instanceOfTicker.ajaxobj=null})
			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(single)
		}
	}
}

ajax_ticker.prototype.rotatemsg=function(single){
	var instanceOfTicker=this
	if (this.mouseoverBol==1) 
		setTimeout(function(){instanceOfTicker.rotatemsg()}, 100)
	else{ 
		this.fadetransition("reset") 
		this.contentdiv.innerHTML=this.messages[this.pointer]
		this.fadetimer1=setInterval(function(){instanceOfTicker.fadetransition('up', 'fadetimer1')}, 100)
		this.pointer=(this.pointer<this.messages.length-1)? this.pointer+1 : 0		
		if (!single) {setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay)}
	}
}


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])
}