Getting file name in uploadify

Here is the code;
The uploadify.php File

$targetFolder = '/uploads'; // Relative to the root

if (!empty($_FILES)) {
    $tempFile = $_FILES['Filedata']['tmp_name'];
    $targetPath = $_SERVER['DOCUMENT_ROOT'] . $targetFolder;
    $targetFile = rtrim($targetPath,'/') . '/' . $_FILES['Filedata']['name'];

    // Validate the file type
    $fileTypes = array('jpg','jpeg','gif','png'); // File extensions
    $fileParts = pathinfo($_FILES['Filedata']['name']);

    if (in_array($fileParts['extension'],$fileTypes)) {
        move_uploaded_file($tempFile,$targetFile);
        echo $targetFolder . '/' . $_FILES['Filedata']['name'];
    } else {
        echo 'Invalid file type.';
    }
} 

The Uploadify Call

$('#file_upload').uploadify({
    // Some options
    'onUploadSuccess' : function(file, data, response) {
        alert('The file was saved to: ' + data);
    }
});