Thanks to everyone for the help. 

For those interested, I have posted the final code below. It functions
beautifully with one exception: the resized image quality is rather poor. I
am now reading through the php manual and newsgroups for a solution, but if
anyone knows how to handle this it would be great to hear from you.

Thanks again for all your help!


--------- BEGIN CODE ------------------

if( $image_id ) 
 $sql="SELECT image_bin_data from IMAGES where image_id='$image_id'";
 $result=db_query ( $sql );
 $record=db_fetch_object ( $result );
 Header("Content-type: image/png");
 $dst_img=@ImageCreate($new_w, $new_h);

--------- END CODE ------------------

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