setbm = function(){
    var bm = 2;
    while(document.getElementById('bm'+bm)!=null){
      document.getElementById('bm'+bm).style.display='none';
      bm++;
    }
  }
  actbm = function(aid){
    var bm = 1;
    while(document.getElementById('bm'+bm)!=null){
      if(bm!=aid){
        document.getElementById('bm'+bm).style.display='none'; 
        document.getElementById('bmc'+bm).className='bmc'; 
      } else {
        document.getElementById('bm'+bm).style.display='block';
        document.getElementById('bmc'+bm).className='bmcsel';
      }
      bm++;
    }
  }