function bbb()
{
  checkboxes = new Array();
  for(var i = 1; i < 10; i++)
  {
    checkboxes.push($("matchtime-"+i));
  }

  checkboxes.each(function(x){
    Event.observe(x, 'change', function(){
      $("matchtime-all").checked = false;
    });
  });

  Event.observe($("matchtime-all"), "change", function(){
    checkboxes.each(function(x){
      x.checked = false;
    });
  });
}

Event.observe(window, 'load', function(){
  bbb();
});