Background Image:

Inserts Document Background image
Prompts for image
Add to a <body> tag

How to use it:  There isn't really much I can add to the information above.  Use this option when you have set up your Document Structure using the HTML, Head, and Body buttons rather than the Basic button.  This is for those occasions when you later change your mind and decide you do want a background image after all.  As noted above, this option prompts you for the image to be inserted.