Page inside of DIV, either close or redirect parent page

[Hobbyist_PHPer]

Hi, I have a, let's call it, Main page, and it refreshes every 5 seconds to check the database... If it finds a result, it kills the refresh function and allows a DIV to call a page into itself via another function on the Main page, which refreshes every second, it's a timer count down clock... The problem is, that if the timer runs down to zero, I have it do a lot of things, but then I need it to either refresh the Main page, redirect the Main page, or close the Main page entirely... Does anyone know how I could perform either 3 of those actions from within the page that's inside of the DIV?