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
// rss_ticker(RSS_id, cachetime, divId, divClass, delay, optionalswitch)
// -------------------------------------------------------------------

function rss_ticker(RSS_id, cachetime, divId, divClass, delay, optionalswitch){
  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 optionalswitch!="undefined")? optionalswitch : -1
	this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over ticker (and pause it if it is)
	this.pointer=0
	this.ajaxobj=createAjaxObj()
	document.write('<div id="'+divId+'" class="'+divClass+'">Initializing ticker...</div>')
	this.getAjaxcontent()
	}

// -------------------------------------------------------------------
// getAjaxcontent()- Makes asynchronous GET request to "rssfetch.php" with the supplied parameters
// -------------------------------------------------------------------

rss_ticker.prototype.getAjaxcontent=function(){
  if (this.ajaxobj){
	var instanceOfTicker=this
	  var parameters="id="+encodeURIComponent(this.RSS_id)+"&cachetime="+this.cachetime+"&bustcache="+new Date().getTime()
	  this.ajaxobj.onreadystatechange=function(){instanceOfTicker.initialize()}
	  this.ajaxobj.open('GET', "/system-cgi/blog/xml-rss2.php", true)
	  this.ajaxobj.send(null)
	  }
}

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

rss_ticker.prototype.initialize=function(){
  if (this.ajaxobj.readyState == 4){ //if request of file completed

	  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 piece of the item element as an attribute of the element
		for (var i=0; i<this.feeditems.length; i++){
		  this.feeditems[i].setAttribute("ctitle", this.feeditems[i].getElementsByTagName("title")[0].firstChild.nodeValue)
		  this.feeditems[i].setAttribute("clink", this.feeditems[i].getElementsByTagName("link")[0].firstChild.nodeValue)
		  this.feeditems[i].setAttribute("cdescription", this.feeditems[i].getElementsByTagName("description")[0].firstChild.nodeValue)
		  this.feeditems[i].setAttribute("pubDate", 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
// -------------------------------------------------------------------

rss_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{
	  var tickerDiv=document.getElementById(this.tickerid)
	  var tickercontent='<h3>'+ this.feeditems[this.pointer].getAttribute("ctitle")+'</h3>'
	  if (this.logicswitch=="showdescription")
	  tickercontent+='<div id="desc">'+this.feeditems[this.pointer].getAttribute("cdescription")+'</div>'
	  tickercontent+='<div id="pubDate">('+this.feeditems[this.pointer].getAttribute("pubDate") + ')</div>'
	  tickerDiv.innerHTML=tickercontent
	  this.pointer=(this.pointer<this.feeditems.length-1)? this.pointer+1 : 0
	  setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //update container every second
	}
}