Lettertype GD images aanpassen?

Ik werk op mn site dus met GD afbeeldingen, nu wil ik daar het lettertype van aanpassen. Dit is mijn normale code;

<?php


// We need to grab an adoptable ID

$id = $_GET["id"];
$id = preg_replace("/[^a-zA-Z0-9s]/", "", $id);
$id = secure($id);

// Check that ID exists and is valid

if(is_numeric($id)){

// The ID appears to be valid, so double check...

$query = "SELECT * FROM ".$prefix."owned_adoptables WHERE aid='$id'";
$result = mysql_query($query);
$num = mysql_numrows($result);

//Loop out code
$i=0;
while ($i < 1) {

$aid=@mysql_result($result,$i,"aid"); //The adoptable's ID
$currentlevel=@mysql_result($result,$i,"currentlevel");
$type=@mysql_result($result,$i,"type");
$name=@mysql_result($result,$i,"name");
$totalclicks=@mysql_result($result,$i,"totalclicks");
$isfrozen=@mysql_result($result,$i,"isfrozen");
$owner=@mysql_result($result,$i,"owner");

$i++;
}

if($aid == $id){

// The adoptable exists, so let's try and show the image

$usingimage = "no";

$image = getcurrentimage($id);

    // Let's see if the server has support for GD or not
    // Also to use fancy images the image must be a gif and fancy images must be enabled...

    $usegd = grabanysetting("gdimages");
    $imageinfo = @getimagesize($image);
    $imagemime = $imageinfo["mime"]; // Mime type of the image file, should be a .gif file...

    if(function_exists('imagegif') and $usegd == "yes" and $imagemime == "image/gif")
    {

    $usingimage = "yes"; //Turn the template system off

    // BEGIN NEW CODE

    list($width, $height, $type, $attr) = getimagesize($image); // The size of the original adoptable image

    // Begin the fancy outputs...

    // Lets create the new target image, with a size big enough for the text for the adoptable

    $newheight = $height + 60;

    if($newwidth < 100){
    $newwidth = 100;
    }
    else{
    $newwidth = $width;
    }

      $img_temp = imagecreatetruecolor($newwidth, $newheight); 


      $alphablending = true;  


        // Lets create the image and save its transparency  
      $img_old = @imagecreatefromgif($image);  
      imagealphablending($img_old, true);  
      imagesavealpha($img_old, true);
   
     // Lets copy the old image into the new image with  
     // the given size  
     ImageCopyResampled(  
         $img_temp,  
         $img_old,  
         0, 0, 0, 0,  
         $width,  
         $height,  
         $width,  
         $height  
     );  
   
    
    $textheight = $width + 2;

    $image = $img_temp;

    $bgi = imagecreatetruecolor($newwidth, $newheight);

    $color = imagecolorallocate($bgi, 51, 51, 51);


    $str1 = " ".$name;
    $str2 = "Level ".$totalclicks;


    imagestring ($image, 12, 0, $textheight,  $str1, $color);
    imagestring ($image, 12, 0, $textheight + 13,  $str2, $color);

    $background = imagecolorallocate($image, 0, 0, 0);  
      ImageColorTransparent($image, $background);  
 
    header("Content-Type: image/GIF");
    ImageGif ($image);
    imagedestroy($image);
    imagedestroy($img_temp);
    imagedestroy($img_old);
    imagedestroy($bgi);

    }
    else{
    
    // We are going to try and get this image the old fashioned way...
    // Define a list of allowed file extentions...

    $extList = array();
    $extList['gif'] = 'image/gif';
    $extList['jpg'] = 'image/jpeg';
    $extList['jpeg'] = 'image/jpeg';
    $extList['png'] = 'image/png';

    //Define the output file type
    $contentType = 'Content-type: '.$extList[ $imageinfo['extension'] ];

    if($imageinfo['extension'] =! "image/gif" and $imageinfo['extension'] =! "image/jpeg" and $imageinfo['extension'] =! "image/png"){

    // The file type is NOT ALLOWED
    die("Hacking Attempt!");

    }
    else{

    // File type is allowed, so proceed
    // Try and read the file in

    $status = "";

    header ($contentType);
    $status = readfile($image);

    if($status == "" or $status == "false" or $status == "FALSE"){

    // Reading the file failed, so show an error...    
    header ("text/plain");
    die("Readfile appears to be disabled on your host.");

    }
    


    } 

    }


}
else{

// Bogus ID

$article_title = $err_idnoexist;
$article_content = $err_idnoexist_text;


}
}
else{

// Bogus ID

$article_title = $err_idnoexist;
$article_content = $err_idnoexist_text;

}



?>

Ik plaats dit;

$font = imageloadfont("adoptables/fonts/arial.gdf");

Boven dit;

 imagestring ($image, 12, 0, $textheight,  $str1, $color);

Maar als ik dit doe verschijnt er gewoon niks! Waar moet het dan wel staan :S?
Ik mag ook enkel .gdf lettertype's gebruiken.