how to get value of variable in to second form from the first form

do you know how to get value of variable in to second form from the first form.
in my application there are two html forms,
in first form i have two listboxs and submit button,
in second form i have only submit button,

now i want to pass the selected value of listbox from 1st form to other new form by
request.getparameter(listbox name from 1st form) through using submit button of second form
not by using that's form's(first forns) submit button

please gve me sort code for it
thanl you