Like Kevin said, though, you'd have to maintain the links on the page manually (they wouldn't update automatically if you changed the main TOC structure). Plus you can't really replicate the book and topic icons unless you make special bullets.
Make sure you submit a feature request at
http://www.madcapsoftware.com/bugs/submit.aspx to add the ability to use the TOC proxy for online output. Right now it's only available for print output. I believe someone else has mentioned the same request somewhat recently, but the more people who request a feature, the more likely that MadCap will add the feature and add it sooner.