no, you don't need to add any code.
Add a button to the form (field type = button, type = "button" not submit, and no URL or Proc)
Add the browse to the form.
then on the "client side" tab for the button, set it to "reset" the browse.
the only code you usually need is for the button itself. Client-side tab, Server-Side code button.
In here you usually set some session variable that is used in the browse filter.
for example
p_web.SetSessionValue('filterdate',today())
Cheers
Bruce