function yanshowStm(n){
	for (i=0;i<=2;i++){
		 document.getElementById("yanstgm" + i).className = "blur";
		 document.getElementById("yanstm" + i).style.display = "none";
    }
	document.getElementById("yanstgm" + n).className = "";
	document.getElementById("yanstm" + n).style.display = "block";
}