[jQuery] Validation plugin errors on IE6

This is just plain infuriating, this piece code works perfectly well
on FF 2, on IE6 , it just causes errors:

// ERROR
error -> "object does´t  support this property or method"
code 0


// CODE

    var container = $('#error_container');

    $("#login_form").validate({
        errorContainer: container,
        errorLabelContainer: $("ol", container),
        wrapper: 'li',
        meta: "validate",
                event: "keyup"
      });  // end validate

     $("#password_lost").validate({
        errorContainer: container,
        errorLabelContainer: $("ol", container),
        wrapper: 'li',
        meta: "validate",
                event: "keyup"
    });  // end validate

Firebug mentions no errors, and if it works well in FF how else can
one test it, I commented out everything else that could cause problems


Does anyone have any ideas?