function tb_xs(t,m,n){
	for(var i=1;i<=m;i++){
	if (i != n){
	document.getElementById("tb"+t+ "_bt" + i).className= "ycbt";
	document.getElementById("tb"+t+ "_nr" + i).className= "ycnr";}
	else{
	document.getElementById("tb"+t+ "_bt" + i).className= "xsbt1";
	document.getElementById("tb"+t+ "_nr" + i).className= "xsnr";}}}