(keitai-l) J-Phone

I am having problems with J-Phone.
Using forms with GET Method, sometimes we're not getting the variables
passed as "hidden".
I guess that I'm exceeding URL lenght limit as commented in
http://www.appelsiini.net/keitai-l/archives/2001-11/0011.html
But I didn't find in any place on the net, reference about this
limitation....
Anybody knows?

Thanks in advance,
Isamar