Hi cutie,
What exactly would you like to change ? The navigation bar?
or would you like to preserve the html within existing content and
pull it into robohelp. You may want to take a look at the skin
editor which allows you to change the look and feel of the
navigation bar (I'm assuming you will be using webhelp to support
your site). You also have the option to use and external editor
such as dreamweaver to edit your topics and conserve the HTML.
Check out the Robohelp help topics:
Customizing the navigation pane with skins and
About using HTML editors
Kind Regards
Craig