// -------------------------------------------------------------------
// Ajax XML Ticker (txt file source)
// Author: Dynamic Drive (http://www.dynamicdrive.com)
// http://www.dynamicdrive.com/dynamicindex2/ajaxticker.htm
//
// NOTE -- JDB: Modifications made so string is passed in rather than 
//              reading a file
// -------------------------------------------------------------------

////////////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()
    var instanceOfTicker = this
    instanceOfTicker.initialize()
}

// -------------------------------------------------------------------
// 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.location.href.indexOf("http") == -1) { //if request was successful
    this.contentdiv = document.getElementById(this.tickerid).firstChild //div of inner content that holds the messages
    //var xmldata = this.ajaxobj.responseText
    var xmldata = this.xmlfile
    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 }
    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 == "bodytextlink")
            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])
}