I am trying to figure out how to copy data from one form's textbox to the textbox in a popup window. The new window's form is rendered in advance from the server side and is accessed by clicking an href link with the target attribute's value being 'extra_window'.
On the page that contains that link to the new window, is a form. Some of the values from 'info_form1' need to be immediately copied to 'info_form2' in the newly opened window.
How can this be done?