function playPause(){
	if(document.getElementsByTagName('audio')[0].paused == false){
		document.getElementsByTagName('audio')[0].pause();
		document.getElementById('sound_icon').src = 'images/sound-off-icon.png';
		document.getElementById('start_music').style.display = 'block';
		document.getElementById('stop_music').style.display = 'none';
	} else {
		document.getElementsByTagName('audio')[0].play();
		document.getElementById('sound_icon').src = 'images/sound-icon.png';
		document.getElementById('start_music').style.display = 'none';
		document.getElementById('stop_music').style.display = 'block';
	}
}