or this method !! ... but be warned if you have other request asynchrnously 
in the page then they will start to become synchronous due to this
But if you dont then this will work too
----- Original Message ----- 
From: "Matt Foster" <[EMAIL PROTECTED]>
To: "Prototype & script.aculo.us" <prototype-scriptaculous@googlegroups.com>
Sent: Tuesday, November 18, 2008 3:26 PM
Subject: [Proto-Scripty] Re: new AjaxRequest.....

> Instead of trying to keep the last reference to the XHR sent, just
> enforce a singleton style approach, such that the user can't request a
> refresh of data when a request is already pending.
> function fireAjax(){
>     if(Ajax.activeRequestCount == 0)
>           new Ajax.Request(...);
> }
> >

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