Reverse Ajax again... FF 1.5.0.9

Hi,

I have a page that worked  a while befor. Today i want to fix some  
design and put it online, but the reverse thing does't work anymore.  
Maybe you can help.

Here are teh related pathes of the JS:

        dwr.util.setEscapeHtml(false);
        dwr.engine.setActiveReverseAjax(true);
        ...
        function receiveMessages(  ){
            Chat.getMessages(gotMessages);
            browserSpecific(); // just a hardcodes reload for safari
        }

The Java-Part looks like this:

        Collection otherSessions = ctx.getScriptSessionsByPage 
(currentPage);
        Iterator iteri = otherSessions.iterator();
        while(iteri.hasNext()){
            ScriptSession otherSession = (ScriptSession) iteri.next();
            System.out.println("Session: "+ otherSession.getId());
            otherSession.addScript(new ScriptBuffer().appendScript 
("receiveMessages("  + ");"));
        }


My web.xml:

    <servlet>
          <servlet-name>dwr-invoker</servlet-name>
  <display-name>DWR Servlet</display-name>
  <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
  <init-param>
    <param-name>debug</param-name>
    <param-value>true</param-value>
  </init-param>
  <init-param>
    <param-name>allowGetForSafariButMakeForgeryEasier</param-name>
    <param-value>true</param-value>
  </init-param>
  <init-param>
    <param-name>pollAndCometEnabled</param-name>
    <param-value>true</param-value>
  </init-param>
</servlet>


I am testing in firefox 1.5.0.9
Do you have any idea?
kris