function get_track(track){
	if(!track)track=MP3_TRACKS[window.MP3_TRACK][0];
	return soundManager.getSoundById(track);
};
function snd_play(nPlay,nStop){
	var snd=get_track();
	if(nPlay && nStop){
		nPlay=document.getElementById(nPlay);
		nStop=document.getElementById(nStop);
		if(nPlay && nStop) {
			nPlay.setAttribute('class','hidden');
			nStop.setAttribute('class','');
		}
	}
	if(snd){
		soundManager.play(snd.sID);
	}
};
function snd_volUp(track){
	var snd=get_track();
	snd.volume=Math.min(100,snd.volume+10);
};
function snd_volDown(track){
	var snd=get_track();
	snd.volume=Math.max(0,snd.volume-10);
};
function snd_stop(nPlay,nStop){
	var snd=get_track();
	if(nPlay && nStop){
                nPlay=document.getElementById(nPlay);
                nStop=document.getElementById(nStop);
                if(nPlay && nStop) {
                        nPlay.setAttribute('class','');
                        nStop.setAttribute('class','hidden');
                }

	}
	soundManager.stopAll();
};
function snd_next(){
	snd_stop();
	if(window.MP3_TRACK<MP3_TRACKS.length-1) window.MP3_TRACK++;
	else window.MP3_TRACK=0;
	snd_play();
};
function snd_prev(){
	snd_stop();
	if(window.MP3_TRACK>0)window.MP3_TRACK--;
	else window.MP3_TRACK=MP3_TRACKS.length-1;
	snd_play();
};