Hey all,

I've got a PHP script here that's supposed to take an uploaded image file and create a 100 x 100 thumbnail for it and save it in the correct directory (/images/portfolio/thumbs). It's creating the 100 x 100 thumbnail and putting it in the directory, but the thumbnail is just a black square, rather than the actual uploaded picture. Here is my code:

Code:
function cropImage($nw, $nh, $source, $stype, $dest) {

         $size = getimagesize($source);
         $w = $size[0];
          $h = $size[1];

          switch($stype) {
              case 'gif':
              $simg = imagecreatefromgif($source);
              break;
              case 'jpg':
              $simg = imagecreatefromjpeg($source);
              break;
              case 'png':
              $simg = imagecreatefrompng($source);
              break;
          }

          $dimg = imagecreatetruecolor($nw, $nh);
          $wm = $w/$nw;
          $hm = $h/$nh;
          $h_height = $nh/2;
          $w_height = $nw/2;

          if($w> $h) {
              $adjusted_width = $w / $hm;
              $half_width = $adjusted_width / 2;
              $int_width = $half_width - $w_height;
              imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
          } elseif(($w <$h) || ($w == $h)) {
              $adjusted_height = $h / $wm;
              $half_height = $adjusted_height / 2;
              $int_height = $half_height - $h_height;

              imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);
          } else {
              imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
          }

          imagejpeg($dimg,$dest,100);
			header("location: index.php");
}
And here is my function call:

Code:
cropImage(100,100,$path_to_thumbs_directory . $filename,'jpg','../images/portfolio/thumbs/'. $filename);
Has anyone else had this problem or know what's going on?

Thanks.