The "today" and "yesterday" boxes all have the far right row offset down by a couple pixels on my browser (firefox/0.9 @ 1024x768)
One suggestion that would help the page load faster and help you solve alignment problems: combine all those thumbnails into a single image and use client side image map stuff. I see you're using PHP, it'd be pretty easy to do it in real time and then cache the result for a day (or hour or however long you keep the same images for).
HTH. HAND.
