function changeClass(id, newclass)
{
	obj = document.getElementById(id);
	obj.className = newclass;
}

function soundImgOff(lang)
{
	lang = typeof(lang) != 'undefined' ? lang : "en";
	if (lang=="es") {
		document.getElementById('soundImg').src="images/es-soundoff.png";
	} else {
		document.getElementById('soundImg').src="images/soundoff.png";
	}
}

function soundImgOn(lang)
{
	lang = typeof(lang) != 'undefined' ? lang : "en";
	if (lang=="es") {
		document.getElementById('soundImg').src="images/es-soundon.png";
	} else {
		document.getElementById('soundImg').src="images/soundon.png";
	}
}

function showListenShort(lang)
{
	lang = typeof(lang) != 'undefined' ? lang : "en";
	window.shortTimeOut=setTimeout("soundImgOn('" + lang + "')",7000);
}

function showListenLong(lang)
{
	lang = typeof(lang) != 'undefined' ? lang : "en";
	window.longTimeOut=setTimeout("soundImgOn('" + lang + "')",60500);		
}

function toggleListen(lang)
{
	lang = typeof(lang) != 'undefined' ? lang : "en";
	if (document.getElementById('soundImg').src.indexOf('soundoff.png')!=-1) {
		soundManager.stop('short');
		soundManager.stop('long');
		soundImgOn(lang);
		if (window.shortTimeOut) {
			clearTimeout(window.shortTimeOut);
		}
		if (window.longTimeOut) {
			clearTimeout(window.longTimeOut);
		}
	} else {
		soundManager.setVolume('long',50);
		soundManager.play('long');
		soundImgOff(lang);
		showListenLong(lang);
	}
}

function trackMusicClicks()
{
	if (document.getElementById('soundImg').src.indexOf('soundoff.png')!=-1) {
		urchinTracker('clicks/images/soundoff.png');
	} else {
		urchinTracker('clicks/audio/zvradio1_60sec.mp3');
	}
}