[PHP-DB] Shrinking gifs

[nikos]

Hello list
I'd like to make a thumbnaile list using some gifs.
I use the following code but I got error (Call to undefined function:
imagecreatefromgif() ).
Does anybody knows what's wrong?

function viewsm($ph) {
        $ph='photo/'.$ph;
        echo $ph;
        $imgReal = imagecreatefromgif($ph);
        $x = ImagesX($imgReal);
        $y = ImagesY($imgReal);
        $newX=$x*0.50;
        $newY=$y*0.50;
        $img = ImageCreate($newX,$newY);
        ImageCopyResized($img, $imgReal, 0, 0, 0, 0, $newX, $newY, $x,
$y);
        return $img;
}

RH-9 Linux
Apache httpd-2.0.40-21.11
PHP Version 4.3.11
gd-1.8.4-11

Thanks
Nikos

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