function callPortfolioBackend(cmd, params, callback){
    var dataIn = ({ key: PORTFOLIO_KEY(), cmd: cmd, params: params });
    $.ajax({
        type: "POST",
        dataType: "html",
        url: "calls.php",
        data: dataIn,
        error: function(xhr, status, error){
            alert(status+": "+error);
        },
        success: function(result){
            if(typeof callback == "function") {
                callback(result)
            } else {
                if (result != "") {
                    alert(result);
                }
            }
        }
    });
}

function renderSubpageCallback(result) {
    $('#divSubpage').html(result);
}

<link type="text/css" media="screen" rel="stylesheet" href="uploadify/uploadify.css" />
<script type="text/javascript" src="uploadify/jquery.uploadify.v2.1.0.min.js"></script>
<script type="text/javascript" src="uploadify/swfobject.js"></script>
<script type="text/javascript">

    function addPhotoDetailsCallback(result) {
        $('#uploadfiles_log').append("<li>"+result+"</li>");
    }

    $(function(){
        $('#btn_uploadfiles').uploadify({
            uploader: 'uploadify/uploadify.swf',
            script: 'uploadify/uploadify.php',
            checkScript: 'uploadify/check.php',
            multi: true,
            folder: '{{DIR_PHOTOS}}',
            cancelImg: 'uploadify/cancel.png',
            onComplete: function(event, queueID, fileObj, response, data) {
                $('#uploadfiles_log').append('<li>uploaded <a href='+fileObj.filePath+'>'+fileObj.name+'</a></li>');
                callPortfolioBackend("addPhotoDetails", ["{{DIR_PHOTOS}}"+fileObj.name], addPhotoDetailsCallback);
            }
        });

        $('#btn_uploadfiles_start').button().click(function () {
            $('#btn_uploadfiles').uploadifyUpload();
        });
    });
</script>
<div class="admin_wrapper">
    <br /><br />
    <h2>add entry</h2>
    <div>
        <button id="btn_uploadfiles">Browse</button>
        <button id="btn_uploadfiles_start">Upload</button>
        <br />
        <div id="uploadfiles_log"></div>
    </div>
    <br /><br />
</div>