Integrating robohelp with VB6

Hello,
We have created help application with robohelp. Those are html files only (not .chm and not .hlp). We have one main .htm file that has navigating panel from the right side and when clicking the item, the page is opened in the left frame.
How can I from the VB application to open the help url exactly at the place that i need. Every form in the VB application has its html.
I know how to integrate using .chm file and HelpContextID but that is what i don't need.
I hope i explained myself clearly :)
Thanks a lot