Hi David,
Thank you so much fort the tip.
Answering to your second point:
> The HTML editor also has a source code mode (the button looks like "") which should in theory allow you to edit code too.
That was my initially problem: I wrote the mapping html code outside the editor, then i cut'npaste it using the source code mode, but then... the editor erase it during saving process, "loosing" the maps specs (try if you want to check it). That's the reason why i've posted my thread.
More generally, it will be interesting to know how the editor works in the background. I've rode that javascript code isn't allowed, but maps are a really "old way" to use html and i was a little astonished in discovering that!
Anyway, i'll try to do like you suggest, and i will post the results in case of success
Luca