There are a few ways you can use the filters.

This will download any HTML and JPG files from any pages, including external
links:

+*.html +*.jpg



This will download HTML and JPG files from "www.somewhere.com" but nowhere
else:

+www.somewhere.com/+*.html
+www.somewhere.com/+*.jpg

 

If you're looking to download only HTML and JPG files from a specific address
I would recommend the following filters:

-*
+www.somewhere.com/+*.html
+www.somewhere.com/+*.jpg
-mime:*/* +mime:image/jpg +mime:text/html