function checkFlash(reqFlashVer){
	var version = GetSwfMajorVer();
	if(GetSwfMajorVer()<reqFlashVer){
		elt = document.getElementById('error');
		if(elt){
			if(version == -1){
				elt.innerHTML = '<div>In order to fully experience our lesson, Adobe Flash Player must be installed on your system. Click <a href="http://www.adobe.com/go/getflash/">here</a> to update your system for free.</div>';
			}else{
				elt.innerHTML = '<div>Your Flash Player is outdated. In order to fully experience our lesson, Adobe Flash Player v7 must be installed on your system. Click <a href="http://www.adobe.com/go/getflash/">here</a> to update your system for free.</div>';
			}
		}
	}
}

var srcs = Array();
var rootpath;
function initComp(root, lvl, media, vb1, vb2){
	rootpath = root;
	var i;
	for(i=1; i<=15; i++){
		if(i<10){
			srcs[i] = root + 'media/phrases/' + lvl + '/' + media + '_' + lvl + '_0' + i + '.mp3';
		}else{
			srcs[i] = root + 'media/phrases/' + lvl + '/' + media + '_' + lvl + '_' + i + '.mp3';
		}
		srcs[16] = root + 'media/verbs/' + lvl + '/' + vb1 + '_' + lvl + '.mp3';
		srcs[17] = root + 'media/verbs/' + lvl + '/' + vb2 + '_' + lvl + '.mp3';
	}
}

var crtid;
function swap(id){
	var elt;
	if(crtid){
		elt = document.getElementById('snd' + crtid);
		if(elt){
			elt.innerHTML = '<a href="javascript: swap(' + crtid + ')";>'
		}
	}
	crtid = id;
	elt = document.getElementById('snd' + crtid);
	if(elt){
		elt.innerHTML = '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,0,0" width="20" height="20"><param name="allowScriptAccess" value="sameDomain" /><param name="wmode" value="transparent" /><param name="flashVars" value="src=' + srcs[crtid] + '" /><param name="movie" value="' + rootpath + 'ext/play.swf" /><embed src="' + rootpath + 'ext/play.swf" wmode="transparent" width="20" height="20" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashVars="src=' + srcs[crtid] + '" /></object>';
	}
}

//Inspired from FlashDetectionKit
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;
		}
	}
	if(version != -1){
		var tempArray         = version.split(" "); 	// ["WIN", "2,0,0,11"]
		var	tempString        = tempArray[1];			// "2,0,0,11"
		var	versionArray      = tempString.split(",");	// ['2', '0', '0', '11']
		version = versionArray[0];
	}
	return version;
}

// JavaScript helper required to detect Flash Player PlugIn version information
function GetSwfMajorVer(){
	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;
	// 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(".");
			flashVer = tempArrayMajor[0];
		}
	}
	// 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;
}