I will give you an example:
<BODY background="C:\My DocumentsMy Picturesiceberg.jpg">
This will give us this.
(note: the tag will be the same for both background color and background image)
<BODY bgcolor="yellow" bgproperties="fixed">
The fixed property for background color is not clearly visualised by the visitor.
It will appear like the background color is also moving along with the text and pictures and graphics
or anything you put on the page.
To see an example, click here.
For the background image fixed property, do this:
<BODY background="C:\My DocumentsMy Picturesiceberg.jpg" bgproperties="fixed">
See the example here.