Embed images in HTMLHelp file

How do I embed images in the
resulting HTMLHelp file (.chm)? I use xsltproc to transform my docbook XML file
and then compiles the resulting htmlhelp.hhp using hhc.exe.

I don't want separate image files
because:

I want to distribute the HTMLHelp file

The images are located on a network drive and thus I get absolute
     path's in my HTMLHelp file, which points to somewhere not accessible by the
     users of the HTMLHelp file

TIA

/Carpalia