note 43758 added to function.imagegif

Estoy intentando redimensionar un gif con esta funcion que copiado del foro: function redimensionarGif($fn,$vraz){ header("Content-Type: image/gif \n\n"); list($width, $height, $value, $params) = GetImageSize($fn); echo $width."--".$height."<br>"; $new_width = ceil($width/$vraz); $new_height = ceil($height/$vraz); $new_width2 = ceil($width/$vraz)."0"; $new_height2 = ceil($height/$vraz)."0"; echo $new_width."--".$new_height."<br>".$fn; $newImage = imagecreate($new_width, $new_height); $cpyImage = imagecreatefromgif($fn); imagecopyresized($newImage, $cpyImage, 0, 0, 0, 0, $new_width, $new_height, $width, $height); imagegif($newImage,$fn); imagedestroy($newImage); } pero me sale este error: "Call to undefined function: imagegif() ", tengo instalado gd, alguien me puede ayudar. Gracias ---- Manual Page -- http://www.php.net/manual/en/function.imagegif.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+43758 Delete -- http://master.php.net/manage/user-notes.php?action=delete+43758&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+43758&report=yes Search -- http://master.php.net/manage/user-notes.php