How do I embed graphics into a RoboHelp HTML file?

I am using RH 11 and generating to WebHelp.  My developers want the Release Notes to be one HTML file with the graphics embedded and not linked.  They are okay with having a cascading style sheet.

How do I get my Release Notes set up so that the graphics are embedded and not linked, such that there is one HTML file and a cascading style sheet?

Thanks!