you should put this, wait...

EDIT:

Here is a simple xcf with the stuff: -> [Link: dl.dropbox.com]


Just to let you know. You don't need to put the backward action on a button on the hidden page, you can pin it also to a macro (the category above the pages) and execute with:
CF.widget("MY_MACRO", "SOME_MACROS", "PS_MACROS").scheduleAfter();

Yes, the first number in the scheduleAfter is the amount of seconds it waits.