Problems with AbstractAjaxTimerBehavior

[Jani Väisänen]

I have a case with AbstractAjaxTimerBehavior on wicket 1.3.1. 
AbstractAjaxTimerBehavior seems to add header-contribution to every ajax 
response.

The method renderHead calls super.renderHead 
(AbstractDefaultAjaxBehavior), which adds lines:
- response.renderJavascriptReference(WicketEventReference.INSTANCE);		- 
response.renderJavascriptReference(WicketAjaxReference.INSTANCE);
to every response.
This behavior causes at least usability problems in IE6.

-Jani