Passing values back & forth between other pages

[adriann]

I encounterd a form which required a date in a specific format.
I clicked on an icon representing a calendar.
A calendar object in a tiny window lauched to allow me to choose a date.
After clicking OK, I was returned to the original form, and the date value was passed into the text field.

How would this have been done?

thank you

[Banfa]

Probably not in PHP, try javascript