/* cmh.org homepage banner */

// IF 'CMH' SCOPE HAS NOT BEEN CREATED
// BY A PREVIOUS FILE CREATE IT.
//
if (!cmh)
{
	var cmh = {};
}

//cmh.HomePageAds = function(bannerDivID, bannerXML, bannerHeight, bannerWidth)
cmh.HomePageAds = function(bannerDivID, bannerHeight, bannerWidth)
{
	// VARIABLE DEFINITIONS
	//
	var xmlURL = '/homepageads.xml';
	//var xmlURL = bannerXML;

	var bannerDiv = document.getElementById(bannerDivID);
	
	var currentBannerDiv = 0;
	var currentBannerIndex = 0;

	var bannerH = bannerHeight;
	var bannerW = bannerWidth;

	var bannerXMLDoc;
	var bannerCollection = new Array();

	var banner0 = document.createElement('div');
	var banner1 = document.createElement('div');

	var prevLink = document.createElement('a');
	var nextLink = document.createElement('a');

	var transitionInProgress;

	var	autoRotationSpeed;
	var autoRotationTimer;

	var baseZIndex = 1000;

	function onLoad()
	{
		loadXML();

		// LOOP THROUGH THE RETRIEVED XML DOCUMENT AND CREATE
		// AN OBJECT FOR EACH BANNER WITH THE ASSOCIATED ATTRIBUTES.
		// EACH OBJECT IS THEN LOADED INTO THE BANNER COLLECTION 
		// ARRAY AND USED AS SUCH: bannerCollection[index].attributeName
		//
		for (var i = 0; i < bannerXMLDoc.length; i++)
		{
			bannerCollection[i] = get_ItemValues( bannerXMLDoc[i] );
		}
		
		// REMOVE SWF ITEMS IF CLIENT DOES NOT HAVE FLASH INSTALLED
		//
		if (GetSwfVer() == -1)
		{
			removeSWFs();
		}

		// REMOVES ALL BANNERS THAT HAVE EXPIRED
		//
		removeExpiredBanners();

		// GET RANDOM LOAD POINT - WHILE CALCULATING SEED
		//
		currentBannerIndex = get_SeededIndex();

		// BEGIN CREATION OF BANNERS
		//
		banner0.id		= 'homepagead_0';
		banner1.id		= 'homepagead_1';

		banner0.style.display	 = banner1.style.display	= 'block';
		banner0.style.height	 = banner1.style.height		= bannerH +'px';
		banner0.style.width		 = banner1.style.width		= bannerW + 'px';
		banner0.style.overflow	 = banner1.style.overflow	= 'hidden';
		banner0.style.position	 = banner1.style.position	= 'absolute';
		banner0.style.top		 = banner1.style.top		= '0px';
		banner0.style.left		 = banner1.style.left		= '0px';
		banner0.style.textAlign	 = banner1.style.textAlign	= 'left';
		banner0.style.color		 = banner1.style.color		= 'white';

		bannerDiv.appendChild(banner1);
		bannerDiv.appendChild(banner0);

		// BEGIN CREATION OF NAVIGATION
		//
		prevLink.innerHTML = '<img src="/includes/JSAdRotator/images/prev.png" border="0" />';
		nextLink.innerHTML = '<img src="/includes/JSAdRotator/images/next.png" border="0" />';

		prevLink.style.top = nextLink.style.top = (bannerH - 35) + 'px';

		nextLink.style.left = (bannerW - 32) + 'px';
		prevLink.style.left = (bannerW - 62) + 'px';

		prevLink.style.zIndex	 = nextLink.style.zIndex	= baseZIndex + 3;
		prevLink.style.display	 = nextLink.style.display	= 'block';
		prevLink.style.position	 = nextLink.style.position	= 'absolute';
		prevLink.style.color	 = nextLink.style.color		= '#002d9a';
		prevLink.style.cursor	 = nextLink.style.cursor	= 'pointer';

		// IF ONLY ONE BANNER IS PRESENT TURN
		// OFF THE NAVIGATION AND AUTO-ROTATION.
		//
		if (bannerCollection.length > 1)
		{
			bannerDiv.appendChild(prevLink);
			bannerDiv.appendChild(nextLink);

			Event.observe(prevLink, 'click', get_PreviousItem.bindAsEventListener(this));
			Event.observe(nextLink, 'click', get_NextItem.bindAsEventListener(this));
		}
		else
		{
			autoRotationSpeed = 0;
		}

		for (var i = 0; i < bannerCollection.length; i++)
		{
			if (bannerCollection[i].type == 'img')
			{
				cmh.PreloadImages(bannerCollection[i].path);
			}
		}

		load_Item(currentBannerIndex, currentBannerDiv);

		// IF AUTO ROTATION IS NOT SET TO '0' [OFF]
		// TRIGGER THE AUTO ROTATE FUNCTION
		//
		if (autoRotationSpeed != 0)
		{
			startAutoRotation();
		}
	}
	onLoad();

	function loadXML()
	{
		new Ajax.Request(xmlURL,
		{
			asynchronous: false,
			method: "get",
			onSuccess: function(transport)
			{
				bannerXMLDoc = transport.responseXML.getElementsByTagName('Ad');
				autoRotationSpeed = transport.responseXML.getElementsByTagName('Advertisements')[0].getAttribute('rotationSpeed');
			}
		});
	}

	function get_NextItem()
	{
		if (transitionInProgress == true) return;

		if (currentBannerDiv == 0) 
			var nextBannerDiv = 1;
		else
			var nextBannerDiv = 0;

		if (currentBannerIndex == (bannerCollection.length - 1))
			currentBannerIndex = 0;
		else
			currentBannerIndex = currentBannerIndex + 1;

		load_Item(currentBannerIndex, nextBannerDiv);
		fadeItem(currentBannerDiv, nextBannerDiv);
		
		if (autoRotationSpeed != 0)
		{
			clearTimeout(autoRotationTimer);
			startAutoRotation();
		}
	}

	function get_PreviousItem()
	{
		if (transitionInProgress == true) return;

		if (currentBannerDiv == 0) 
			var nextBannerDiv = 1;
		else
			var nextBannerDiv = 0;

		if (currentBannerIndex == 0)
			currentBannerIndex = bannerCollection.length - 1;
		else
			currentBannerIndex = currentBannerIndex - 1;

		load_Item(currentBannerIndex, nextBannerDiv);
		fadeItem(currentBannerDiv, nextBannerDiv);

		if (autoRotationSpeed != 0)
		{
			clearTimeout(autoRotationTimer);
			startAutoRotation();
		}
	}

	function fadeItem(currentDiv, nextDiv)
	{
		transitionInProgress = true;

		var a = document.getElementById('homepagead_' + currentDiv);
		var b = document.getElementById('homepagead_' + nextDiv);

		new Effect.Appear(b, {
			duration: 0.0,
			afterFinish: function()
			{
				fadeout();
			}
		});

		function fadeout()
		{
			new Effect.Fade(a, {
				duration: 0.5, 
				afterFinish: function()
				{
					b.style.zIndex = baseZIndex + 2;
					a.style.zIndex = baseZIndex + 1;

					transitionInProgress = false;
				}
			});
		}

		currentBannerDiv = nextDiv;
	}

	function load_Item(index, div)
	{
		var element = document.getElementById('homepagead_' + div);

		if (bannerCollection[index].type == 'img')
		{
			element.innerHTML = '<a href="' + bannerCollection[index].url + '" target="_self">'
				+ '<img src="' + bannerCollection[index].path + '" alt="' + bannerCollection[index].alt + '" border="0" />'
				+ '</a>';
		}
		else
		{
			element.innerHTML = '<object type="application/x-shockwave-flash" data="' + bannerCollection[index].path + '" width="537" height="189" style="z-index:500;">'
				+ '<param name="movie" value="' + bannerCollection[index].path + '" />'
				+ '<param name="FlashVars" value="adLink="' + bannerCollection[index].url + '" />'
				+ '<param name="wmode" value="transparent" />'
				+ 'failed'
				+ '</object>';
		}
	}

	function get_ItemValues(Item)
	{
		var values = {};

		values.path	= get_NodeValue( Item.getElementsByTagName('ImageUrl')[0] );
		values.url	= get_NodeValue( Item.getElementsByTagName('NavigateUrl')[0] );
		values.alt	= get_NodeValue( Item.getElementsByTagName('AlternateText')[0] );
		values.type	= get_NodeValue( Item.getElementsByTagName('Type')[0] );
		values.seed	= get_NodeValue( Item.getElementsByTagName('Impressions')[0] );

		var Expiration = Item.getElementsByTagName('Expiration')[0];
		
		values.expDay	= Expiration.getAttribute('day') || 1;
		values.expMonth	= (Expiration.getAttribute('month') - 1) || 0;
		values.expYear	= Expiration.getAttribute('year') || 9999;

		return values;
	}

	function get_NodeValue(node)
	{
		return node.text || node.textContent || node.innerText;
	}

	function startAutoRotation()
	{
		autoRotationTimer = setInterval(function(){
			get_NextItem();
		}, (autoRotationSpeed * 1000));

		//alert('foo');
	}

	// FOO
	//
	function get_SeededIndex()
	{
		var totalSeedValue = get_TotalSeedValue();

		var randomIndex = Math.floor(Math.random() * totalSeedValue);
		
		var seedRange = new Array();
		
		var indexBasedOnSeed;
		
		// Set seed range using the combined values of ad_Seed
		//
		seedRange = [0];
		for (var i = 0; i < bannerCollection.length; i++)
		{
			var n = parseInt(bannerCollection[i].seed) + parseInt(seedRange[i]);
			seedRange = seedRange.concat(n);
		}

		// USING THE SEED RANGE GENERATED ABOVE, THE 
		// RANDOMLY GENERATED INDEX IS COMPARED TO FIND
		// WHAT RANGE THE INDEX LIES BETWEEN
		//
		for (var i = 1; i < seedRange.length; i++)
		{
			if (randomIndex <= seedRange[i] && randomIndex >= seedRange[i-1])
			{
				indexBasedOnSeed = i - 1;
				break;
			}
		}

		return indexBasedOnSeed;
	}

	// THIS FUNCTION CYCLES THROUGH THE BANNER COLLECTION
	// TESTING EACH ENTRY FOR TYPE OF 'SWF'. IF TYPE IS A 
	// MATCH THAT ENTRY IS REMOVED FROM THE COLLECTION.
	//
	function removeSWFs()
	{
		var swfIndex = new Array();
		
		// LOOP THROUGH BANNER COLLECTION TESTING ENTRY 
		// TYPE AGAINST 'SWF'. IF MATCH IS FOUND ENTRY 
		// INDEX IS LOGGED INTO INDEX ARRAY.
		//
		for (var i = 0; i < bannerCollection.length; i++)
		{
			if (bannerCollection[i].type == 'swf')
			{
				swfIndex.push(i);
			}
		}
		
		// LOOP THROUGH INDEX ARRAY FOR SWF ENTRIES
		// REMOVING THEM FROM THE BANNER COLLECTION.
		//
		for (var i = 0; i < swfIndex.length; i++)
		{
			var index = parseInt( swfIndex[i] );
			
			for (var i = 0; i < swfIndex.length; i++)
			{
				bannerCollection.splice(index, 1);
			}
		}
	}

	// SIMILAR IN FUNCTION TO removeSWFs() THIS FUNCTION
	// CYCLES THROUGH THE BANNER COLLECTION TESTING THE 
	// EXPIRATION DATE AGAINST THE CURRENT DATE. IF CURRENT
	// DATE IS PASSED EXPIRATION THAT ENTRY IS REMOVED.
	//
	function removeExpiredBanners()
	{
		var expIndex = new Array();

		// LOOP THROUGH BANNER COLLECTION TESTING ENTRY 
		// EXPIRATION AGAINST THE CURRENT DATE. IF PAST 
		// ENTRY IS EXPIRED LOG ENTRY INDEX INTO INDEX ARRAY.
		//
		for (var i = 0; i < bannerCollection.length; i++)
		{
			// CREATE EXPIRATION DATE OBJECT
			//
			var expDate = new Date();
			var d = bannerCollection[i].expDay;
			var m = bannerCollection[i].expMonth;
			var y = bannerCollection[i].expYear;
			expDate.setFullYear(y,m,d);

			// CREATE CURRENT DATE OBJECT
			//
			var today = new Date();

			if (today > expDate)
			{
				expIndex.push(i);
			}
		}

		// LOOP THROUGH INDEX ARRAY FOR EXPIRED ENTRIES
		// REMOVING THEM FROM THE BANNER COLLECTION.
		//
		for (var i = 0; i < expIndex.length; i++)
		{
			var index = parseInt( expIndex[i] );
			
			for (var i = 0; i < expIndex.length; i++)
			{
				bannerCollection.splice(index, 1);
			}
		}
	}

	// CALCULATES THE TOTAL SUM OF SEED WEIGHT
	// FOR ALL ENTRIES IN THE XML
	//
	function get_TotalSeedValue()
	{
		var n = 0;

		for (i = 0; i < bannerCollection.length; i++)
		{
			n = n + parseInt(bannerCollection[i].seed);
		}

		return n;
	}
}

// PRELOAD IMAGES FOR QUICKER VIEWING
// USE IN FOLLOWING MANNER: cmh.PreloadImages('item1', 'item2');
//
cmh.PreloadImages = function()
{
	var doc = document;

	if (doc.images)
	{
		if (!doc.plDump)
		{
			doc.plDump = new Array();
		}

		var i;
		var j = doc.plDump.length;
		var args = cmh.PreloadImages.arguments;

		for (i = 0; i < args.length; i++)
		{
			document.plDump[j] = new Image();
			document.plDump[j].src = args[i];

			j++;
		}
	}
}

// EXTENSION OF STRING OBJECT ALLOWING USER TO TEST
// IF STRING IS BOOLEAN.
//
String.prototype.toBoolean = function()
{
	switch (this.toLowerCase())
	{
		case "true": case "yes": case "1": return true; break;
		case "false": case "no": case "0": return false; break;
		default: return false; break;
	}
}

// ----------------------------------------------------------------------------------
// THIRD PARTY SCRIPTING - DO NOT EDIT BELOW THIS LINE
// ----------------------------------------------------------------------------------

// Flash Detection Script (Adobe Inc.)
var isIE  = (navigator.appVersion.indexOf("MSIE") != -1) ? true : false;
var isWin = (navigator.appVersion.toLowerCase().indexOf("win") != -1) ? true : false;
var isOpera = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;

function ControlVersion()
{
	var version;
	var axo;
	var e;

	// NOTE : new ActiveXObject(strFoo) throws an exception if strFoo isn't in the registry

	try {
		// version will be set for 7.X or greater players
		axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.7");
		version = axo.GetVariable("$version");
	} catch (e) {
	}

	if (!version)
	{
		try {
			// version will be set for 6.X players only
			axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.6");
			
			// installed player is some revision of 6.0
			// GetVariable("$version") crashes for versions 6.0.22 through 6.0.29,
			// so we have to be careful. 
			
			// default to the first public version
			version = "WIN 6,0,21,0";

			// throws if AllowScripAccess does not exist (introduced in 6.0r47)		
			axo.AllowScriptAccess = "always";

			// safe to call for 6.0r47 or greater
			version = axo.GetVariable("$version");

		} catch (e) {
		}
	}

	if (!version)
	{
		try {
			// version will be set for 4.X or 5.X player
			axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.3");
			version = axo.GetVariable("$version");
		} catch (e) {
		}
	}

	if (!version)
	{
		try {
			// version will be set for 3.X player
			axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.3");
			version = "WIN 3,0,18,0";
		} catch (e) {
		}
	}

	if (!version)
	{
		try {
			// version will be set for 2.X player
			axo = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
			version = "WIN 2,0,0,11";
		} catch (e) {
			version = -1;
		}
	}
	
	return version;
}

// JavaScript helper required to detect Flash Player PlugIn version information
function GetSwfVer(){
	// NS/Opera version >= 3 check for Flash plugin in plugin array
	var flashVer = -1;
	
	if (navigator.plugins != null && navigator.plugins.length > 0) {
		if (navigator.plugins["Shockwave Flash 2.0"] || navigator.plugins["Shockwave Flash"]) {
			var swVer2 = navigator.plugins["Shockwave Flash 2.0"] ? " 2.0" : "";
			var flashDescription = navigator.plugins["Shockwave Flash" + swVer2].description;
			var descArray = flashDescription.split(" ");
			var tempArrayMajor = descArray[2].split(".");			
			var versionMajor = tempArrayMajor[0];
			var versionMinor = tempArrayMajor[1];
			var versionRevision = descArray[3];
			if (versionRevision == "") {
				versionRevision = descArray[4];
			}
			if (versionRevision[0] == "d") {
				versionRevision = versionRevision.substring(1);
			} else if (versionRevision[0] == "r") {
				versionRevision = versionRevision.substring(1);
				if (versionRevision.indexOf("d") > 0) {
					versionRevision = versionRevision.substring(0, versionRevision.indexOf("d"));
				}
			}
			var flashVer = versionMajor + "." + versionMinor + "." + versionRevision;
		}
	}
	// MSN/WebTV 2.6 supports Flash 4
	else if (navigator.userAgent.toLowerCase().indexOf("webtv/2.6") != -1) flashVer = 4;
	// WebTV 2.5 supports Flash 3
	else if (navigator.userAgent.toLowerCase().indexOf("webtv/2.5") != -1) flashVer = 3;
	// older WebTV supports Flash 2
	else if (navigator.userAgent.toLowerCase().indexOf("webtv") != -1) flashVer = 2;
	else if ( isIE && isWin && !isOpera ) {
		flashVer = ControlVersion();
	}	
	return flashVer;
}