submit does not work with jquery fields

Sorry for my Inglês, i'm brazilian and not so good.
my problem:
i have a form created byform library  from my collection of libraries.
however there are fields that I add dynamically  (jquery).
. $ ( "# Col") append (text);
when I click submit, I can not retrieve the value passed in this field.
$ This-> input-> post () returns only the fields that was created through the form_input ().
how to proceed?