[jQuery] Basic AJAX Q: how to replace current with XHR-fetched page?

[jQuery] Basic AJAX Q: how to replace current with XHR-fetched page?

<div dir="ltr">This is the most basic AJAX question.  Suppose my script fetches a new page using $.( '<a href="http://some/url"> http://some/url</a>', ... ).  I'd now like to replace the currently displayed page with the newly fetched one.  I suppose that I need to make a new DOM subtree from the downloaded content and replace the subtree corresponding to the current page with this newly generated subtree...  But I'm not sure of how one does this.<div>
<br class="webkit-block-placeholder"></div><div>Could someone show me how to do this?  (Or point me to an example?)</div><div><br class="webkit-block-placeholder"></div><div>TIA!</div><div><br class="webkit-block-placeholder">
</div><div>Kynn</div><div><br class="webkit-block-placeholder"></div></div>