I'm sorry I haven't looked at this. It might work.
But I think I wasn't clear enough in my first post.
If I may say so, your stylesheets looked like overkill, but I realize
that you also have...

I only use a text editor to produce my sites.
Currently I'm using Geany, which is context-sensitive.

I tried DreamWeaver a long time ago, but it imposed too many limitations. It's probably better...

The reason why I didn't go into details was that I haven't been using much JavaScript lately so it's a little rusty.

But make a function like this:

function onoff (id,onoff)
{ if...

I can imagine one good use of frames, but I'm afraid it would be somewhat dependent on the browser in use. Standard solutions however, should not be.

I understand your request for a solution where...

I would define margins:
If I have a "div" that I want to center, I define its margins like this:

margin: 1em auto 2em auto;

This example gives me a space of 1em above, 2em below, and automatic...