function bian(s,n,id){
    var i;
    for(i=1;i<=n;i++){
        if(i == id) {
            document.getElementById(s+i).className="up";
            document.getElementById("room"+s+i).className="room";
        } else {
            document.getElementById(s+i).className="";
            document.getElementById("room"+s+i).className="room h";
        }
    }
};