Cross Window Scripting

My main page is made of several iFrames.

In order to permit each of this iFrames to use functions of the main page, I introduce them with the function above :

function to_old_win(url) {top.location.href = url;}

and I call the MainPage functions (here, the setZ function) that way in the iFrame-pages :

onClick='javascript: to_old_win("javascript: setZ( iFrame number )");' ...and it works great.

My problem is that it does not work at all when the main page is on my hard disk, and the iFrame-pages are on Line.

I want to accede onLine-iFrame-pages from a onHardDisk main page (using the iFrame-pages global pathes), but then, they can't use the main page functions with the "to_old_win" one.

Could you please tell me if it is possible wherever the main page is located in on my hard disk, and how ?
(and if you could try to explain me why my version isn't ok...)

Thanks for all,
King regards,

when my main-page is Hard-Disk hosted, onLine-iFrames can't find its location (in such a configuration, top.location becomes undefined -empty, in fact, what is worse-),
but I still don't know why !!!

An other methode than mine might probably exist !


Thanks for any indication.

Isn't anybody expert with page location ?

When everything is onLine, it's OK.
When everything is Hard-disk Hosted, it's OK.

Doesn't anybody know why onLine and Hard-Disk Hosted pages can't exchange informations ?