function cent(id){
		if(id==1){
		document.getElementById('cent_1').className="bk01";
		document.getElementById('cent_2').className="bk02";
		document.getElementById('cent_1c').style.display="block";
		document.getElementById('cent_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('cent_1').className="bk011";
		document.getElementById('cent_2').className="bk022";
		document.getElementById('cent_1c').style.display="none";
		document.getElementById('cent_2c').style.display="block";
		}
		}

		function rb(id){
		if(id==1){
		document.getElementById('rb_1').className="bq01";
		document.getElementById('rb_2').className="bq02";
		document.getElementById('rb_1c').style.display="block";
		document.getElementById('rb_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('rb_1').className="bq011";
		document.getElementById('rb_2').className="bq022";
		document.getElementById('rb_1c').style.display="none";
		document.getElementById('rb_2c').style.display="block";
		}
		}