// Browser type as detected by getBrowser()
var browser = '';
// Default app state URL to use when no fragment ID present
var defaultUrl = '';
// Last-known app state URL
var curUrl = document.location.href;
// Initial URL (used only by IE)
var initialUrl = document.location.href;
// History frame source URL prefix (used only by IE)
var historyFrameSourcePrefix = 'historyFrame.html?';
// History maintenance (used only by Safari)
var curHistoryLength = -1;
var historyHash = new Array();
/* Autodetect browser type; sets browser var to 'IE', 'Safari', 'Firefox' or empty string. */
function getBrowser(){
	var name = navigator.appName;
	var agent = navigator.userAgent.toLowerCase();	
	if (name.indexOf('Microsoft') != -1){
		if (agent.indexOf('mac') == -1){
			browser = 'IE';
			// note that Mac IE is considered to be uncategorized
		}
	} else if (agent.indexOf('safari') != -1) {
		browser = 'Safari';
	} else if (agent.indexOf('firefox') != -1) {
		browser = 'Firefox';
	}
}
/* Get the Flash player object for performing ExternalInterface callbacks. */
function getPlayer(getPlayerId){
	var player = document.getElementById(getPlayerId);
	if (player == null) player = document.getElementsByTagName('object')[0];  
	if (player == null || player.object == null) player = document.getElementsByTagName('embed')[0];
	return player;
}
function thisMovie(movieName) {
	if (navigator.appName.indexOf("Microsoft") != -1) {
			return window[movieName];
	} else {
			return document[movieName];
	}
}
/* Get the current location hash excluding the '#' symbol. */
function getHash(){
	// It would be nice if we could use document.location.hash here,
	// but it's faulty sometimes.
	var idx = document.location.href.indexOf('#');
	return (idx >= 0) ? document.location.href.substr(idx+1) : '';
}
/* Set the current browser URL; called from inside URLKit to propagate
 * the application state out to the container.
 */
function setBrowserUrl(flexAppUrl){
	var pos = document.location.href.indexOf('#');
	var baseUrl = pos != -1 ? document.location.href.substr(0, pos) : document.location.href;
	var newUrl = baseUrl + '#' + flexAppUrl;
	if (document.location.href != newUrl && document.location.href + '#' != newUrl){
		curUrl = newUrl;
		addHistoryEntry(baseUrl, newUrl, flexAppUrl);
		curHistoryLength = history.length;
	}
	return false;
}
/* Add a history entry to the browser.
 *   baseUrl: the portion of the location prior to the '#'
 *   newUrl: the entire new URL, including '#' and following fragment
 *   flexAppUrl: the portion of the location following the '#' only
 */
function addHistoryEntry(baseUrl, newUrl, flexAppUrl){
	if (browser == 'IE'){
		//Check to see if we are being asked to do a navigate for the first
		//history entry, and if so ignore, because it's coming from the creation
		//of the history iframe
		if (flexAppUrl == defaultUrl && document.location.href == initialUrl){
			curUrl = initialUrl;
			return;
		}
		if (!flexAppUrl) {
			newUrl = baseUrl + '#' + defaultUrl;
		} else {
			// for IE, tell the history frame to go somewhere without a '#'
			// in order to get this entry into the browser history.
			getHistoryFrame().src = historyFrameSourcePrefix + flexAppUrl;
		}
		document.location.href = newUrl;
	} else {
		if (browser == 'Safari') {
			// for Safari, submit a form whose action points to the desired URL
			getFormElement().innerHTML = '<form name="historyForm" action="#' + flexAppUrl + '" method="GET"></form>';
			document.forms.historyForm.submit();
			// We also have to maintain the history by hand for Safari
			historyHash[history.length] = flexAppUrl;
		} else {
			// Otherwise, write an anchor into the page and tell the browser to go there
			addAnchor(flexAppUrl);
			document.location.hash = flexAppUrl;
		}
	}
}
/* Called periodically to poll to see if we need to detect navigation that has occurred */
function checkForUrlChange(){
	if (browser == 'IE'){
		if (curUrl != document.location.href){
			//This occurs when the user has navigated to a specific URL
			//within the app, and didn't use browser back/forward
			//IE seems to have a bug where it stops updating the URL it
			//shows the end-user at this point, but programatically it
			//appears to be correct.  Do a full app reload to get around
			//this issue.
			curUrl = document.location.href;
			document.location.reload();
		}
	} else if (browser == 'Safari') {
		// For Safari, we have to check to see if history.length changed.
		if (curHistoryLength >= 0 && history.length != curHistoryLength){
			// If it did change, then we have to look the old state up
			// in our hand-maintained array since document.location.hash
			// won't have changed, then call back into URLKit.
			
			curHistoryLength = history.length;
			var flexAppUrl = historyHash[curHistoryLength];
			if (flexAppUrl == '') flexAppUrl = defaultUrl;
			//getPlayer().setPlayerUrl(flexAppUrl);
			thisMovie("HealthCareSpeakers").setPlayerUrl(flexAppUrl);
		}
	} else {
		if (curUrl != document.location.href) {
			// Firefox changed; do a callback into URLKit to tell it.
			curUrl = document.location.href;
			var flexAppUrl = getHash();
			if (flexAppUrl == '') flexAppUrl = defaultUrl;
			//getPlayer().setPlayerUrl(flexAppUrl);
			getPlayer("HealthCareSpeakers").setPlayerUrl(flexAppUrl);
		}
	}
	setTimeout(checkForUrlChange, 250);
}
function setDefaultUrl(def){
   defaultUrl = def;
	//trailing ? is important else an extra frame gets added to the history
	//when navigating back to the first page.  Alternatively could check
	//in history frame navigation to compare # and ?.
	if (browser == 'IE'){
		getHistoryFrame().src = historyFrameSourcePrefix + defaultUrl;
	} else if (browser == 'Safari') {
		curHistoryLength = history.length;
		historyHash[curHistoryLength] = defaultUrl;
	}
}
function setTitle(title){
	document.title = title;
}
/* Write an anchor into the page to legitimize it as a URL for Firefox et al. */
function addAnchor(flexAppUrl){
	if (document.getElementsByName(flexAppUrl).length == 0) {
		getAnchorElement().innerHTML += "<a name='" + flexAppUrl + "'>" + flexAppUrl + "</a>";
	}
}
// Accessor functions for obtaining specific elements of the page.
function getHistoryFrame(){
	return document.getElementById('historyFrame');
}
function getAnchorElement(){
	return document.getElementById('anchorDiv');
}
function getFormElement(){
	return document.getElementById('formDiv');
}
// Initialization
getBrowser();
setTimeout(checkForUrlChange, 250);