------------- datebox WebObject -------------------------------
* - The webobject datebox can be used to select the date from a calendar.
    It can be used like this:
    First include the webclass that defines it:

        <Include SRC="{{DATEBOX_PATH}}datebox.html" />
        (DATEBOX_PATH is defined by the framework)

    Then declare as many datebox objects as needed:

        <WebObject Class="datebox" Name="information_date"
               value="{{info_date}}"
               format="YYYY-MM-DD"
               onchange="check_selected_date(this)" />

        <WebObject Class="datebox" Name="proposal_date" />
        <WebObject Class="datebox" Name="contact_date" />

        etc.

    The attribute 'value' is used to initialize the datebox
    with an initial value. If it is not given, then the
    default is {{{{obj_name}}}} (in the last example above 
    it would be {{contact_date}}).

    The attribute 'format' is used to specify the format of the
    date. The reckognized formats are:
         YYYY-MM-DD (default)
         MM/DD/YYYY
         MM-DD-YYYY
         DD/MM/YYYY
         DD-MM-YYYY
    Actually this is only the format of the display, because the
    internal format is allways YYYY-MM-DD, the format used by
    the databases. E.g. if the above datebox webobject is declared
    inside a form with the name 'editDoc', then 
    "document.editDoc.information_date.value" returns the date in
    the internal format (in the format YYYY-MM-DD).

    The attribute 'onchange' (be carefull, all lowercase) is used
    to call any validation function at the time that the date is changed.
    If you pass 'this' as a argument to this function, then it
    refers to the display format. E.g. if 'date' is the parameter to
    which 'this' is passed, then "d = date.value;" gets the selected
    date in the display format (which is specified by the attribute
    'format'), and "date.value = d;" sets the date of the datebox
    ('d' should be in the format specified by 'format').

    If you want to modify this webobject, you can copy it to a path 
    local to the application, modify it and use the modified copy, e.g.
        <Include SRC="{{./}}datebox/datebox.html" />

Bugs: When you change the date, the validation code of the "onchange"
      is executed and it changes the date like this: "date.value = d;"
      the internal value is not updated, so the value saved in the DB
      is the selected one (which is wrong).