/*
 ======================================================================
 RSS JavaScript Ticker object
 Author: George at JavaScriptKit.com/ DynamicDrive.com
 Created: Feb 5th, 2006. Updated: Feb 5th, 2006
 ======================================================================
 */

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
			+ '" style="font-weight:bold;font-family:Trebuchet MS">Initializing ticker...<br/>Please wait a moment...</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', "/rssfetch.php?" + parameters, 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
		if (this.ajaxobj.status == 200) { // if request was successful
			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 peice of the item
			// element as an attribute of the element
			for ( var i = 0; i < this.feeditems.length; i++) {
				if(this.feeditems[i].getElementsByTagName("title")[0].firstChild!=null){
					this.feeditems[i].setAttribute("ctitle", this.feeditems[i]
							.getElementsByTagName("title")[0].firstChild.nodeValue);
				}
				
				if(this.feeditems[i].getElementsByTagName("link")[0].firstChild!=null){
					this.feeditems[i].setAttribute("clink", this.feeditems[i]
							.getElementsByTagName("link")[0].firstChild.nodeValue);
				}
				
				if(this.feeditems[i].getElementsByTagName("description")[0].firstChild!=null){
					this.feeditems[i].setAttribute(
									"cdescription",
									this.feeditems[i].getElementsByTagName("description")[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 = '<a href="'
				+ this.feeditems[this.pointer].getAttribute("clink")
				+ '" target="_blank">'
				+ this.feeditems[this.pointer].getAttribute("ctitle").substr(0,55) + '...</a>'
		if (this.logicswitch == "showdescription")
			tickercontent += "<br />"
					+ this.feeditems[this.pointer].getAttribute("cdescription")
		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
	}
}