Serial Asynchrounous XmlHTTPRequest
<p>Is this a better way to do a serial asyn call. </p>

<p><a href="http://ajaxian.com/archives/serial-async-xhr" rel="nofollow">http://ajaxian.com/archives/serial-async-xhr</a></p>

<pre><code>function run() { 
    request1(function () { 
        request2(function () { 
            request3(function () { 
                done(); 
            }); 
        }); 
    }); 
} 
</code></pre>

<p>Will this cause a callback-hell problem?</p>
