Refresh Drop-Down from Child Page

I have a drop down in a form on my parent page that has a list of “pages”. Now, when a user wants to add a page, they click on “Add Page” and a pop-up comes out and the information they put in gets sent to the sever.

Now what I want to happen is have the drop down list refresh itself with the new “page” information the user just put in. I do not want to refresh the entire page since the user will likely have put information into the form and will not want to lose it.

I have seen the .load() in Jquery, but I want the drop down to refresh when the information is sent, not every 3 seconds.

Thanks,
Brandon