DWR

It seems that somehow the timeout that is set on my first dwr call doesn't get 'cleared' properly, and i end up getting a timeout on a subsequent call. Everything works correctly on IE7 though. The remote method that is called takes about one second to execute. With firefox I get an 'instant' timeout after around every 5th call (which coincides with the set timeout of 5s).

The following code should hopefully clarify the problem:

var requestInProgress = false; // flag so the calls don't overlap.
setInterval(pollResult, 1000); // Fire requests periodically (to
demonstrate the issue)

function pollResult() {
   if (requestInProgress) return;
   else requestInProgress = true;

   Remote.someMethod("test", {
       callback: function() { requestInProgress = false; },
       timeout: 5000, // About every 5th call returns
instantly with a timeout
       errorHandler: function() { alert("timeout"); requestInProgress =
false; }
   });
}


The dwr.xml looks like this:
...
<create creator="spring" javascript="Remote">
   <param name="beanName" value="remote" />
</create>
...

application-context.xml:
...
<bean id="remote" class="de.mb.test.dwr.Remote" />
...


I am currently using DWR Version 2.0.2 in combination with Spring 2.05 and Tomcat v5.5.