[Moo] getting id after Request.HTML (grab the html.content after an ajax call)

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Hello I have a problem to get an id after Request.HTML

i'am doing a new Request.HTML ({ ...
                        update: $('comments-box'),   ..

in the comment-box are a lot of diffs like
<div id="comment-1029-x" class="comment">

now i have a function to treat the diffs like

var comments = $$('.comment')
function reply() {  alert(comments.length);
        if(comments.length) { ...
                     var open = -1;
             comments.each(function(comment,i) {
                       //add the "reply" link
              var el = new Element('a',{ ...

but alert(comments.length); shows allways 0

does it mean that i can't grab the html.content after an ajax call?