WebmasterWorld.com HTML Fourm:

The background of this paragraph should have a background image! The image, however, is stored elsewhere on the hard drive - locally!! Just to note, you should never link to a local image on your HDD using an absolute directory path! Very bad! It will only work on your own machine / within your own environment, and if you want to move it to the web later, you'll have to change it! You should link relatively or, if you are using a web server (such as Apache or IIS) then you can use absolute paths, which are relative to the root of your webspace. If you are viewing this page on the web, then you won't see a background image, just a plain pinky background!

NB: Firefox, under a server environment, refuses to display the image and reports a security error! However, locally (non webserver), it does work.