Bookmarks are working in chm, but not in Webhelp output

I have one project that I have output both as a chm and as a webhelp project.  One one of the pages, I have some image maps linked to bookmarks on the same page.  These work fine in the CHM, but in the Webhelp, when I click on the image map area, nothing happens.  Am I missing a setting for Webhelp that makes these links work?

Thanks,

kb

(RH10)