This folder [pb] and folder pb-id contain the implementation of the script published at this link
In these two folders run the same cookie-scripts with small differences and different cookie values. The visible input text box [topleft] will be hidden in your final implementatiom.
The idea is that the document.idform.id.value = id; status may be retrieved and used to dynamically perform related actions besides the one that runs herein, such as making some extra comment visible in case the value is no_id or This_Id, or string if surfer comes from send.html etc ... please read the author presentation before surfing the pages on this site :-)