DHTML: how to show/hide annotations paragraph with [+/-]-'button'?

[Moon]

Well, this is my first attempt at DHTML so I'm asking for some pointers,
hopefully in the right groups, follow-up is set.

I'm currently working on another translation of an english text and I'd
like to add some annotations/comments. However, I want the translated text
to be first read without my comments so the reader can make up his mind
based on the original text only.

It should look like this:

bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
[+]
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
[+]
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
The complete text including my comments is loaded at startup but only the
original text (bla) is displayed initially. Only when you click on a [+]
another small paragraph should open below the translation and a click on
[-] should make it disappear again:
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
[-]
me me me me me me me me me me me me me me me me me me me me me me me me me

bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
[+]
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla

Any pointers on how to achieve this on Firefox/Opera/IE alike are welcome.
--
Trusted Computing FAQ (TCPA/Palladium/NGSCB) deutsch
http://moon.hipjoint.de/tcpa-palladium-faq-de.html