function selectAll(cbList,bSelect) {
  for (var i=0; i<cbList.length; i++)
  { 
    cbList[i].selected = cbList[i].checked = bSelect;
  }
}

function clearAll(cbList) {
  for (var i=0; i<cbList.length; i++)
  { 
    cbList[i].selected = cbList[i].checked = false;
  }
}