function show_div ( id,id2,id3 ) {
  for ( var i = 1; i <= id3; i ++ ) {
    var div = document.getElementById(id2+''+i);
    div.style.display = 'none';
  }
  var divs = document.getElementById(id2+''+id);
  divs.style.display = 'block';
}

function show_div2 ( id ) {
  var divs = document.getElementsByTagName('div');
  for ( var i = 0; i < divs.length; i ++ ) {
    var div = divs.item(i);
    if ( /show/.test( div.className ) ) {
      if ( div.id == id ) {
        div.style.display = 'block';
      } else {
        div.style.display = 'none';
      }
    }
  }
}