search engine for javascript or / and css by source code snippets

this is not a programming question as such but still...

does anyone know of a service / spider / crawler that can fetch javascript or CSS resources embedded through standard methods (or lazy l开发者_开发知识库oading, whatever it can cope with)

practical use for it: search for a unique piece of code from a class or function you've written and get a list of sites that reference it. or, for that matter, search for something unique out of framework and get an idea of its popularity.

http://www.dreamincode.net/code/browse.php?cid=11

and

http://www.dreamincode.net/code/browse.php

Its providing free....

http://www.astahost.com/info.php/free-code-snippets-css-layout_t13198.html

http://www.koders.com/ and http://www.google.com/codesearch ?