Save a single web page (with background images) with Wget

"It sounds like wget and Firefox are not parsing the CSS for links to include those files in the download. You could work around those limitations by wget'ing what you can, and scripting the link extraction from any CSS or Javascript in the downloaded files to generate a list of files you missed. Then a second run of wget on that list of links could grab whatever was missed (use the -i flag to specify a file listing URLs).

If you like Perl, there's a CSS::Parser module on CPAN that may give you an easy means to extract links in this fashion.

Note that wget is only parsing certain html markup (href/src) and css uris (url()) to determine what page requisites to get. You might try using Firefox addons like DOM Inspector or Firebug to figure out if the 3rd-party images you aren't getting are being added through Javascript -- if so, you'll need to resort to a script or Firefox plugin to get them too."