[Katman]

I did that originally.

Forget it, I see, Duh, you added the border=0

// ###################### Start dothumb #######################
function dothumb($code) {

  $img_info = @getimagesize($code);
  if($img_info[0]) {
    if(($img_info[0] <= 320) and ($img_info[1] <= 240)) {
      $code = "<a href=\"$code\" target=\"_blank\"><img src=\"$code\"></a>";
    }
    else {
      $xratio = $img_info[0] / 320;
      $yratio = $img_info[1] / 240;
      $factor = $xratio;
      if($yratio > $xratio) {
        $factor = $yratio;
      }
      $xsize = intval($img_info[0] / $factor);
      $ysize = intval($img_info[1] / $factor);
      $code="<a href=\"$code\" target=\"_blank\"><img src=\"$code\" width=\"$xsize\" height=\"$ysize\" border=\"0\"></a><br><font size=\"-2\">(click for larger image)</font>";
    }
  }

  return($code);
}
// ###################### End dothumb #######################