How do I view source of Javascript popup windows

Well, I think it is javascript.

When I do this in my script:

if _IELinkClickByText($oIE, $searchobj) <> -1 Then
    Local $NewUserButton = _IEGetObjById($oIE, 'coreForm:table1:createUserToolbar:createUserButton')
    _IEAction($NewUserButton, "click")
EndIf

a javascript windows popup. Just like when you have to add code to a post here on Autoit or if you press the "Manage Topic Poll".

On this popup windows I need to have control to a radiobutton and a "next" button.

How do I find these objects on the popup windows?

Thank you.