function change_visible_speed(id_int)
{
  change_visible_none();

  document.getElementById("block_speed" + id_int).style.display = "block";
}

function change_visible_quality(id_int)
{
  change_visible_none();

  document.getElementById("block_quality" + id_int).style.display = "block";
}

function close_block_on_main(n)
{
  document.getElementById("block_speed" + n).style.display = "none";
}

function close_block_on_main_q(n)
{

document.getElementById("block_quality" + n).style.display = "none";

}

function change_visible_none()
{
  for (var i_int = 0; i_int <= 5; i_int++)
  {
    document.getElementById("block_quality" + i_int).style.display = "none";
  }
  
  for (var i_int = 0; i_int <= 5; i_int++)
  {
    document.getElementById("block_speed" + i_int).style.display = "none";
  }
}