Must Go links

This script is useful if you need your visitors to see a page[A] and/or [B] before going on to see page[Z]
e.g. Must see Terms and Conditions or an advert before they continue.
Example:     required link [A]
required link [B]
my site here [Z]
Follow the editing instructions after the // and within the <!--comment tags-->
to customize the script, then copy and paste it into your HTML editor.