Tricky MySQL / php Script

I have a bunch of thumbnails that are pulled from a recordset based on a user profile. Each thumbnail opens the picture into another page so that the picture is larger and I want to now have that user's pictures accessible by clicking a previous and/or next arrow. The first recordset of thumbnails is retrieved by a URL link ($HTTP_GET_VARS['id']) which is the user's ID number. Click on one of the thumbnails a new page is open that display the larger photo, but only that photo. I can of course pass along the user's ID as well mypage.php?photoID=uploads/1052367746.jpg&userID=215 which of course will allow me to create a new recordset based on the user's id SELECT * FROM penpals_photos WHERE penpals_photos.filename = $photoID but how do I point the database first record at the photoID so that I can use the next and previous options to see the next/previous picture?