Please give a url etc so I know what you are referring to. I am unaware of any ajax features when viewing a category. Only ajax features I know of are on showphoto.
If you do not wish to show a more button on the thumbnail previews on showphoto.php finding these lines
Code:
Content visible to verified customers only.
and
Code:
Content visible to verified customers only.
and making them this will remove the more button
Code:
Content visible to verified customers only.
Code:
Content visible to verified customers only.