Retain content of a form text when jump to another page

Dear all,

I have a list (with pagination) and a form below it which contain a
text area with a submit button. When the user enter text into the text
area and navigate to another page (of pagination) without submit the
form, I want to retain the content of the text area so that the
content would be there in the new page. What should I do to get this
functionality? I guess I should attach a javascript into the
navigation link to get the content of the text are to put into params
or something, but I don't know how to do.

Thanks a lot,
- Chuong