function playPause(){
				if(document.getElementsByTagName('audio')[0].paused == false){
					document.getElementsByTagName('audio')[0].pause();
					document.getElementById('sound_icon').src = 'assets/images/index/speaker_off.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 = 'assets/images/index/speaker_on.png';
					document.getElementById('start_music').style.display = 'none';
					document.getElementById('stop_music').style.display = 'block';
				}
				
			}