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  1. or download this
    $top    = $page * 20 - 20; 
$bottom = $top + 19;
  2. or download this
    $top    = $page * 20; 
$bottom = $top + 19;
  3. or download this
    $top    = $page * 20 - 19; 
$bottom = $top + 19; 
...
# A clearer Alternative: 
$bottom = $page * 20; 
$top    = $bottom - 19;
  4. or download this
    $top    = $pages * 20 + 1; 
$bottom = $top + 19;