Use an event on a button and use history.goback(-1) as the task to perform when the event is triggered.
Thank you Ray
I like this one
"Or pass the name of the calling form as a hidden form field. The form that is
to return simply returns to the name provided in the form field. "
Which puts my question one step further : how do I pass the name of the
calling form on the called page in other words how do I give a hidden field on
the called page the value of the calling form?
Thank you for your help