Validating input

Hi there,
is there a way to do client side validation vor min., max. values.
I have to check if a value entered is within a certain range e.g. 5-104.
How can these constraint be provided (dynamic and static?)
Help would be appreciated.

Best regards,
Matthias

…and with the new version 2.2 (released January this year) the FIELD control provides for a validation rules editor. See attached schreenshot to see the rule the interval 5-104.

Martin