function showcp(nownum,maxnum){
    for(var i=1;i<=maxnum;i++){
        document.getElementById("ln"+i).className="";
        document.getElementById("cp"+i).style.display="none";
        if(i==nownum){
            document.getElementById("ln"+nownum).className="li_over";
            document.getElementById("cp"+nownum).style.display="";
        }
    }
}