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     + Radio buttons

=item B<onChange>

The user has changed the contents of a field. Valid for:

     + Text fields
     + Text areas
     + Password fields
     + File fields
     + Popup Menus
     + Scrolling lists

=item B<onFocus>

The user has selected a field to work with. Valid for:

     + Text fields
     + Text areas
     + Password fields
     + File fields
     + Popup Menus
     + Scrolling lists

=item B<onBlur>

The user has deselected a field (gone to work somewhere else).  Valid
for:

     + Text fields
     + Text areas
     + Password fields
     + File fields
     + Popup Menus
     + Scrolling lists

=item B<onSelect>

The user has changed the part of a text field that is selected.  Valid
for:

     + Text fields
     + Text areas
     + Password fields
     + File fields

=item B<onMouseOver>

The mouse has moved over an element.

     + Text fields
     + Text areas
     + Password fields
     + File fields
     + Popup Menus
     + Scrolling lists

=item B<onMouseOut>

The mouse has moved off an element.

     + Text fields
     + Text areas
     + Password fields
     + File fields
     + Popup Menus
     + Scrolling lists

=back

In order to register a JavaScript event handler with an HTML element,
just use the event name as a parameter when you call the corresponding
CGI method. For example, to have your validateAge() JavaScript code
executed every time the textfield named "age" changes, generate the
field like this: