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copied!<p>It's very hard if not impossible to answer this question on the basis of the information you've given, but: Perhaps you're talking about the <a href="http://en.wikipedia.org/wiki/Xmlhttprequest" rel="nofollow noreferrer"><code>XMLHttpRequest</code></a> object. It's job is to send a GET or POST (or sometimes other verbs) request to the server and receive the response, without doing a page refresh. For instance, when you submit a comment on a question or answer here on StackOverflow, an XHR (as they're frequently called) is used to send your comment to the server rather than requiring the entire page to be reloaded.</p> <p>XHR isn't very hard to use directly, but it's even easier to do this if you use a library like <a href="http://prototypejs.org" rel="nofollow noreferrer">Prototype</a>, <a href="http://jquery.com" rel="nofollow noreferrer">jQuery</a>, <a href="http://code.google.com/closure/library" rel="nofollow noreferrer">Closure</a>, or <a href="http://en.wikipedia.org/wiki/List_of_JavaScript_libraries" rel="nofollow noreferrer">any of several others</a> that will handle some browser idiosyncracies for you and generally make the API a bit simpler.</p> <hr> <p><strong>Edit</strong> Based on your updated question:</p> <p>My guess was probably correct: <code>ajaxObj</code> is probably an instance of <code>XMLHttpRequest</code>, since <code>responeText</code> is one of the <code>XMLHttpRequest</code> properties. (Or it might be a Prototype <code>Ajax.Response</code>, as they used the same name; other frameworks may have done something similar.)</p> <p>What that code is doing is checking to see if the <code>ajaxObj</code> variable refers to something and, if so, the code replaces the content of the <code>divResult</code> div with the markup that the server sent back in response to the request (looking up the element by ID and then setting its <code>innerHTML</code> property).</p>

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