frames, targets, navigation and links

Hello everybody !
I’m new to this forum, and I think I would need some help…
Here’s my problem, which is not really as simple as it might seem.
I’m currently working on a website, using frames, and inline frames.
On the left ( as often ), I have a navigation bar, with topics. When I click on a topic name, it scrolls down to show some subtopics ( I made this by simply reloading a new bar in place of the old one ). My problem is :
when I click on the topic, I want the topic description to appear in the mainframe ( my inline frame ), as well as the bar to reload itself. That would mean a double link with a double target, which is, I think, impossible.
So, my question is : is there a simple possibility, using either simple html or javascript, to developp the menu without having to reload the navigation bar ?
Here is a small exemple, as I know my english might seem a bit odd and difficult to understand :

TOPIC

when you click on it, you get :

TOPIC

[list]

When you click on TOPIC again, you get :
TOPIC
Which is the initial bar.

What I want :

TOPIC | Welcome page ( inline frame )

When I click :

TOPIC

[list]

When I click again :

TOPIC | Welcome page

I hope it’s not too difficult to understand…
Sorry if I should have posted this in the javascript subforum, I don’t even know if this is html or javascript….
Thanks for all your propositions !
Ness

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