> the whole site is having lots of small images which
> are not mentioned in html file..
> instead its in css file how to get those file.

Don't bother to mention the site or the page or the links or the settings you
used. No mind readers here! Always post the command used (log file line two or
doit.log)

Probably the css and or the image is not on the starting site. Use the near
flag (get non-html related)