Along with dom traversal (ala CSS2), you can also use CSS2 and CSS3 selectors in jQuery. For example:

lb = $('a[rel="lightbox"]');

will get you all the anchor elements in the dom which have the rel="lightbox" attribute. This, however:

lb = $('a[rel*="light"]');

will get you all the anchor elements in the dom which have the substring “light” in their rel attribute.