form works in Netscape4.7 not in IE6

Hi
I work with PL/SQL and use TOAD. I have the following procedure:
procedure muokkaus_valinta(ckeksi in varchar2, cruutu in asio_amk.str_arr, chtun in varchar2) is
It displays a form with a few tables. Each tablerow starts with a checkbox, after that two tabledata's, first one contains a code of a course and the second the name of the course. After that 9 textboxes which stands for the 9 semesters of a study. Students can themselves choose in what semester they want to follow their courses.
On pressing a buttom a next form is opened:
htp.formOpen(amkppath||'hops', 'get');
htp.formHidden('ckeksi');
htp.formHidden('cruutu', 'w');
htp.formSubmit('', 'Päivitä opintojaksot');
htp.formclose;
The following procedure(form) opens:
procedure muokkaus(ckeksi in varchar2, cruutu in asio_amk.str_arr, chtun in varchar2, cojakso2 in asio_amk.str_arr:=asio_amk.null_arr,
lk1 in asio_amk.str_arr:=asio_amk.null_arr, lk2 in asio_amk.str_arr:=asio_amk.null_arr, lk3 in asio_amk.str_arr:=asio_amk.null_arr, lk4 in asio_amk.str_arr:=asio_amk.null_arr, lk5 in asio_amk.str_arr:=asio_amk.null_arr,
lk6 in asio_amk.str_arr:=asio_amk.null_arr, lk7 in asio_amk.str_arr:=asio_amk.null_arr, lk8 in asio_amk.str_arr:=asio_amk.null_arr, lk9 in asio_amk.str_arr:=asio_amk.null_arr) is

Lk1...lk9 are ofcourse the names of the textboxes.

Anyone has any idea why this doesn't work with IE, but does with Netscape?
Do I need to give more information?
Thanx!!!