onFilterChange
The instruction(s) to be executed are placed within quotes. This event handler will execute the instruction(s) when a filter state has changed or a filter transition has completed.

The following example will display text of your choosing in a message box when a filter state has changed or a filter transition has completed:
onFilterChange="msgWindow.document.write('-- Insert text message here --')"
This Event Handler is used with the following:

ACRONYM
ADDRESS
B
BIG
BLOACKQUOTE
BODY
BUTTON
CAPTION
CENTER
CITE
CODE
DD
DEL
DFN
DIR
DL
DT
EM
FIELDSET
FONT
FORM
H1
H2
H3
H4
H5
H6
HR
I
IMG
INS
LBD
LABEL
LI
LISTING
MENU
OBJECT
OL
P
PLAINTEXT
PRE
Q
S
SAMP
SELECT
SMALL
SPAN
STRIKE
STRONG
SUB
SUP
TBODY
TD
TEXTAREA
TFOOT
TH
THEAD
TR
TT
U
UL
VAR
XMP