image calculation problem

Hi, I copied this from the php site, but trying to modify it is driving me nuts coz its not working. Basically I am trying to make a thumb where the width is 87px...I dont care what the height is, heres the code: function prop_thumb_height() { // The file $filename = 'cat.jpg'; // Set a maximum height and width $width = 87; $height = 175; // Content type header('Content-type: image/jpeg'); // Get new dimensions list($width_orig, $height_orig) = getimagesize($filename); if ($width && ($width_orig < $height_orig)) { $width = ($height / $height_orig) * $width_orig; } else { $height = ($width / $width_orig) * $height_orig; } // Resample $image_p = imagecreatetruecolor($width, $height); $image = imagecreatefromjpeg($filename); imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig); // Output imagejpeg($image_p, 'ryan.jpg', 100); } Thanks, Ryan -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.9.7 - Release Date: 4/12/2005