// -------------------------------------------------------------------
// Ajax XML Ticker (txt file source)
// Author: Dynamic Drive (http://www.dynamicdrive.com)
// NOTES: (jw 22 sept 2008) 
//   - Uses ajax to get the content file.
//   - The content file is actually in HTML, not XML - then
//       you can use html formatting, images etc.
// 
// -------------------------------------------------------------------

////////////No need to edit beyond here//////////////

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

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

function ajax_ticker(xmlfile, divId, divClass, delay, fadeornot) {
    // the local ticker xml file (txt):
    // (when using through cms, needs full web path to file)
    this.xmlfile = '/javascripts/ajaxticker-content.txt'; 

// alert(this.xmlfile);

    // ID of ticker div to display information
    this.tickerid = divId 

    // Delay between msg change, in milliseconds.
    this.delay=delay 

    // Boolean: whether mouse is currently over ticker (and pause it if it is)
    this.mouseoverBol=0 

    this.pointer=0
    this.opacitystring=(typeof fadeornot!="undefined")? "width: 100%; filter:progid:DXImageTransform.Microsoft.alpha(opacity=100); -moz-opacity: 1" : ""
    //
    //add 1/2 sec to account for fade effect, if enabled
    if (this.opacitystring!="") this.delay+=500 

    // Opacity value when reset. Internal use.
    this.opacitysetting=0.2 

    //Arrays to hold each message of ticker
    this.messages=[] 

    this.ajaxobj=createAjaxObj()

    document.write('<div id="' + divId + '" class="' + divClass + '"><div style="' + this.opacitystring + '; display: inline;">. . .</div></div>')

    this.getXMLfile()
}

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

ajax_ticker.prototype.getXMLfile=function(){

    if (this.ajaxobj){
        var instanceOfTicker=this
        // (when using through cms, bustcache breaks the script)
        // var url=this.xmlfile+"?bustcache="+new Date().getTime()
        var url=this.xmlfile

        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 request of file completed:
	if (this.ajaxobj.readyState == 4){ 

        // if request was successful
		if (this.ajaxobj.status==200 || window.location.href.indexOf("http")==-1) { 

            // Div of inner content that holds the messages:
			this.contentdiv=document.getElementById(this.tickerid).firstChild 
			var xmldata=this.ajaxobj.responseText
			this.contentdiv.style.display="none"
			this.contentdiv.innerHTML=xmldata

            //if no messages were found
			if (this.contentdiv.getElementsByTagName("div").length==0) { 
			    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}
			if (window.attachEvent) //Clean up loose references in IE
			window.attachEvent("onunload", function(){instanceOfTicker.contentdiv=instanceOfTicker.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=="message")
			    this.messages[this.messages.length]=this.contentdiv.getElementsByTagName("div")[i].innerHTML
			}
			this.contentdiv.innerHTML=""
			// this.contentdiv.style.display="block"
			this.contentdiv.style.display="inline"
			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])
}