function Show(val) {
  var divColumns = document.getElementById('newsColumns').getElementsByTagName('div');
  for (var i=0;i<divColumns.length;i++) {
    var sector = divColumns[i].className.match('newsSector');
    if (
      (val ==  1) || 
      (val >= 17 && (!sector || divColumns[i].className.match('newsYear'+'_'+val+'_')))  ||
      (val <  17 && (!sector && divColumns[i].getElementsByTagName('em')[0].className.match('newsCol'+'_'+val+'_')))
    ) {
      divColumns[i].style.display = 'block';
    }
    else {
      divColumns[i].style.display = 'none';
    }
    
    if (val < 17 && sector) {
      var em = divColumns[i].getElementsByTagName('em');
      for (var e_i=0;e_i<em.length;e_i++)
        if (em[e_i].className.match('newsCol'+'_'+val+'_'))
          divColumns[i].style.display = 'block';
    }
  }
}