Updating Multiple DIVs With Ajax?

I've created an ajax function which retrieves comments from a news article. But if I am logged in I will also have access to an input field for posting comments. The problem / question is that if I use Ajax I can only update one div with the responseText? How would I go about updating another one where I want to insert my form field. Can I make multiple requests in some certain manner or do I simply create another ajax function updating it separately?

http.onreadystatechange = function(){
if(http.readyState == 4){
document.getElementById(newsId).innerHTML = http.responseText;
}}
http.open("GET", "AjaxController.php?func=newsGetComments&showcomments="+newsId, true)
http.send();