if you change:

<img src="images/image.jpg" alt="site_image" width="800" height="200">

to:

<img src="/images/image.jpg" alt="site_image" width="800" height="200">

(note the / before images) and store image.jpg in a images directory under your configured web root drive (on my lighttpd configuration it is:

server.document-root = "/usr/local/var/www/"

so image.jpg would have a real location of /usr/local/var/www/images/image.jpg) you should find that it works.