function cent(id){
		if(id==1){
		document.getElementById('cent_1').className="bk02";
		document.getElementById('cent_2').className="bk01";
		document.getElementById('cent_3').className="bk01";
		document.getElementById('cent_1c').style.display="block";
		document.getElementById('cent_2c').style.display="none";
		document.getElementById('cent_3c').style.display="none";
		}
		else if(id==2){
		document.getElementById('cent_1').className="bk01";
		document.getElementById('cent_2').className="bk02";
		document.getElementById('cent_3').className="bk01";
		document.getElementById('cent_1c').style.display="none";
		document.getElementById('cent_2c').style.display="block";
		document.getElementById('cent_3c').style.display="none";
		}
		else if(id==3){
		document.getElementById('cent_1').className="bk01";
		document.getElementById('cent_2').className="bk01";
		document.getElementById('cent_3').className="bk02";
		document.getElementById('cent_1c').style.display="none";
		document.getElementById('cent_2c').style.display="none";
		document.getElementById('cent_3c').style.display="block";
		}
		}

		function centb(id){
		if(id==1){
		document.getElementById('centb_1').className="bq02";
		document.getElementById('centb_2').className="bq01";
		document.getElementById('centb_1c').style.display="block";
		document.getElementById('centb_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('centb_1').className="bq01";
		document.getElementById('centb_2').className="bq02";
		document.getElementById('centb_1c').style.display="none";
		document.getElementById('centb_2c').style.display="block";
		}
		}

		function centc(id){
		if(id==1){
		document.getElementById('centc_1').className="bq02";
		document.getElementById('centc_2').className="bq01";
		document.getElementById('centc_1c').style.display="block";
		document.getElementById('centc_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('centc_1').className="bq01";
		document.getElementById('centc_2').className="bq02";
		document.getElementById('centc_1c').style.display="none";
		document.getElementById('centc_2c').style.display="block";
		}
		}

		function qa(id){
		if(id==1){
		document.getElementById('qa_1').className="ab01";
		document.getElementById('qa_2').className="ab02";
		document.getElementById('qa_1c').style.display="block";
		document.getElementById('qa_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('qa_1').className="ab02";
		document.getElementById('qa_2').className="ab01";
		document.getElementById('qa_1c').style.display="none";
		document.getElementById('qa_2c').style.display="block";
		}
		}

		function qb(id){
		if(id==1){
		document.getElementById('qb_1').className="bb01";
		document.getElementById('qb_2').className="bb02";
		document.getElementById('qb_1c').style.display="block";
		document.getElementById('qb_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('qb_1').className="bb02";
		document.getElementById('qb_2').className="bb01";
		document.getElementById('qb_1c').style.display="none";
		document.getElementById('qb_2c').style.display="block";
		}
		}

		function qc(id){
		if(id==1){
		document.getElementById('qc_1').className="bb01";
		document.getElementById('qc_2').className="bb02";
		document.getElementById('qc_1c').style.display="block";
		document.getElementById('qc_2c').style.display="none";
		}
		else if(id==2){
		document.getElementById('qc_1').className="bb02";
		document.getElementById('qc_2').className="bb01";
		document.getElementById('qc_1c').style.display="none";
		document.getElementById('qc_2c').style.display="block";
		}
		}

		function qd(id){
		if(id==1){
		document.getElementById('qd_1').className="cb01";
		document.getElementById('qd_2').className="cb02";
		document.getElementById('qd_3').className="cb02";
		document.getElementById('qd_1c').style.display="block";
		document.getElementById('qd_2c').style.display="none";
		document.getElementById('qd_3c').style.display="none";
		}
		else if(id==2){
		document.getElementById('qd_1').className="cb02";
		document.getElementById('qd_2').className="cb01";
		document.getElementById('qd_3').className="cb02";
		document.getElementById('qd_1c').style.display="none";
		document.getElementById('qd_2c').style.display="block";
		document.getElementById('qd_3c').style.display="none";
		}
		else if(id==3){
		document.getElementById('qd_1').className="cb02";
		document.getElementById('qd_2').className="cb02";
		document.getElementById('qd_3').className="cb01";
		document.getElementById('qd_1c').style.display="none";
		document.getElementById('qd_2c').style.display="none";
		document.getElementById('qd_3c').style.display="block";
		}
		}