var dis_c_id = 1;

function setfos(sid){

	if(sid != dis_c_id){

		document.getelementbyid('nc').classname="nf"+sid;

		document.getelementbyid('nf'+dis_c_id).classname="";

		document.getelementbyid('nf'+sid).classname="nf_on";

		dis_c_id = sid;

	}

}