Popup - passing values with a JS confirm

[aaa]

I am at my wits end I an trying to pass a couple of values to a page with a
UC (parent) from a popup (child). But only after a JS confirm on the child
popup. Seems straight forward. I have only been able to get half working on
either side but not the whole package. I have tried full client side JS, I
have tried RegisterClientScriptBlock ( think this is the more viable
option ). Any help would be appreicated.