CSS Library: Links & Buttons: Here
Author: Dynamic Drive
Breadcrumbs is a term used to describe hierarchical links that tell the visitor where he/she currently is on your site. Visually breadcrumbs are just links with some sort of separator between them, such as a bullet image. This CSS code transforms ordinary looking links into a breadcrumb by giving each link a background image.
There are many different ways to implement breadcrumbs in CSS. Ideally the separator image should not even be part of the link, but dynamically inserted using CSS Generated content. However, since IE6 does not support generated content, that's not feasible at the moment. Then there's the debate over whether breadcrumbs should be implemented as a list, which I personally think is no more appropriate than just using regular <a> elements.
The bullet image: