I have an AJAX function that reloads the current page. Now I don't want to reload the whole page, is it possible to get for example the innerHTML of div#footer in http.responseText? 
What I actually want to do is:

```
document.getElementById("footer").innerHTML = http.responseText.getElementById("footer");

```

But of course it's not possible like that, and I don't want to rewrite the whole page that for example it only prints out the footer if a GET variable exists..
Any ideas? Thanks!