function stopbg(name){
	if(name=='stop'){
	    document.getElementById("muisc").src="";
		document.getElementById("muisc_img1").style.display="block";
		document.getElementById("muisc_img2").style.display="none";
	}
	if(name=='start'){
	    document.getElementById("muisc").src="./muisc/muisc.mp3";
		document.getElementById("muisc_img2").style.display="block";
		document.getElementById("muisc_img1").style.display="none";
	}
}