function expand(s){
  var td = s;
  td.className = "tb_ct2";
}

function collapse(s){
  var td = s;
  td.className = "tb_ct1";
}
function expand1(s,id){
    var td = s;
    td.className = "tb_ct2";
    id.className = "tb_ct2";
}

function collapse1(s,id){
    var td = s;
    td.className = "tb_ct1";
    id.className = "tb_ct1";
}