[jQuery] Strange problem getting width/height

[paolo]

Hello to everybody, I'm writing you since I'm getting a strange
problem with getting height/width of a div I've inserted with div.html
(data);
Ive got this HTML :

  <div id="rootDiv" style="border: 1px solid #BAD3E0; visibility:
hidden;">
        <div id="content">
        </div>
        <div id="navigation" style="width: 20%; text-align: left;
display: block;">
            <div id="prevButton" style="margin: 0px 2px 2px 2px;
float:left;">
                <img src="images/prev.jpg" id="imgPrev" alt="prev" /></
div>
            <div id="nextButton" style="margin: 2px;">
                <img src="images/next.jpg" id="imgNext" alt="next" /></
div>
        </div>
    </div>

I need to autoresize the rootDiv at the size of the div('#content')

Here's the javascript:

    var currentPage = 0;
    var maxPage = 0;

    var idDIV = DIV_ID;
    var args = {
        'lang': lang,
        'keyword': keyword,
        'servicename': servicename,
        'size': size,
        'sourceSite': sourceSite,
        'showSuggested': showSuggested,
        'action': action
    };

    var xhr = $.post(url, args, function(data) {
        var div = $('#content');
        div.html(data);
        currentPage = xhr.getResponseHeader('currentPage');
        maxPage = xhr.getResponseHeader('maxPage');
       (*)
        $(document).oneTime(2000, function(data) {
            var iframe = div.find('#PanelRSSyahoo')[0];
            if (iframe != null) {
                $('#rootDiv').css('width', iframe.clientWidth);
                $('#rootDiv').css('visibility', 'visible');

                if (currentPage == 0)
                    $('#prevButton').css('visibility', 'hidden');
                else
                    $('#prevButton').css('visibility', 'visible');

                if (currentPage == maxPage)
                    $('#nextButton').css('visibility', 'hidden');
                else
                    $('#nextButton').css('visibility', 'visible');
            }
        });
    });

I had to insert the oneTime function otherwise after the (*) I got the
whole width size... it's as if the DOM refreshed after a little bit of
time... but this cause the page to show up two seconds later... any
suggestion??
Thanks in advance

Paolo