Mac Safari 2 issue on first/last gallery image

Lightbox works fine except when i get to the first or last images in a gallery. In other browsers, if there isn't a next or previous image (so, when viewing the first or last images), the next/previous buttons disappear. In Safari, the buttons are still there and when i click on them, lightbox closes as usual, but when i look at my URL, a "#" sign has been appended to it. Now when i click a thumbnail image, Lightbox begins to open, but will not load an image. I end up having to delete the "#" from the URL and then everything works again. Anyone know how to get around this? Thanks!