I want to scan all files but I only want to download files 
which contain a certain string. 

For instnace, I want to scan an entire website and only 
download anything which contains my name, Sean. 

<http://www.foo.com/default.html>
<http://www.foo.com/foofoo/default.html>
<http://www.foo.com/foofoo/sean.jpg>

...default.html which links to ..foofoo/default.html which 
links to ..sean.jpg.

If I set the start page to ..default.html, how can I get it 
to scan that file, but not to download it, but then togoto 
the next and find the jpg to download?