Can't find which template/file to change

Hi all

My old, highly customised, 1.3.5 website is not showing categories properly. When I inspect the element the image link references an old address which I need to change, but I can't find where. If anyone has a minute to look I'd really appreciate it.

In the following example, there should be an image of the word “girls” where the placeholder is:

[url=“The store is temporarily closed for maintenance”]The store is temporarily closed for maintenance