[jQuery] Validation jQuery plugin - onfocusout throws error

[jQuery] Validation jQuery plugin - onfocusout throws error


jquery: 1.2.3
jquery validation plugin: 1.2.1
I have:
<form id="myform" name="myform">
...
</form>
$().ready(){
$("#myform").validate({onfocusout:true});
}
<<<< firebug error message >>>
validator.settings["on" + event.type].call is not a function
on jquery.validate.js line 250
same error msg is thrown with onkeyup as well... Why??
Thank you.