He, my again
I found the reason for JS error in IE 6 and 7 :
Using 3.3.0-SNAPSHOT gives a error, but using 3.2.2.GA works fine !
Tested different 3.3.0-SNAPSHOT versions, (from richfaces-ui-3.3.0-20080919.045725-12.jar to richfaces-ui-3.3.0-20081009.041318-30.jar, with corresponding richfaces-impl-3.3.0-SNAPSHOT.jar/richfaces-api-3.3.0-SNAPSHOT.jar)
and all produce JS error.
I hope, it could be corrected before official 3.3.0 ships out.