function uploadfile() {
    JRequest::setVar('tmpl','component');
    $db             =& JFactory::getDBO();
    $session        = JFactory::getSession();
    $config         = RSCommentsHelper::getConfig();
    $file           = JRequest::getVar('file', null, 'files', 'array');
    $IdComment      = $session->get('com_rscomments.IdComment','');
    $root           = JRequest::getVar('root');
    $url_captcha    = JRequest::getVar('url_captcha');

    if (!$config->enable_upload) return;

    jimport('joomla.filesystem.file');
    $uploadFolder = JPATH_SITE.DS.'components'.DS.'com_rscomments'.DS.'assets'.DS.'files'.DS;

    $valid                  = true;
    $successfully_uploaded  = '';
    $msg                    = '';

    if (!empty($file) && empty($file['error']))
    {
        $src        = $file['tmp_name'];
        $filename   = JFile::makeSafe($file['name']);
        $ext        = strtolower(JFile::getExt($filename));
        $filename   = JFile::stripExt($filename);
        // if we edit the file and upload another file

        $extensions = strtolower($config->allowed_extensions);
        $extensions = str_replace("r",'',$extensions);
        $extensions = explode("n",$extensions);

        if (!empty($extensions) && is_array($extensions) && in_array($ext,$extensions))
        {
            $max_size = 1024 * 1024;
            $set_size = 1;
            if ($max_size > $file['size'])
            {
                while (JFile::exists($uploadFolder.$filename.'.'. $ext))
                    $filename .= rand(10, 99);

                $dest = $uploadFolder.$filename.'.'.$ext;

                // this is the part where I start adding code

                // Get current sizes
                list ($startWidth,$startHeight) = getimagesize($src);

                // conditional statement
                if ($startWidth > 500) {

                // Load image
                $src_to_resize = imagecreatefromjpeg($src);

                // setting new width and calculate new height
                $newWidth = 500;
                $newHeight = (int) ($startHeight * (500 / $startWidth));

                // create a new temporary image
                $tmp = imagecreatetruecolor($newWidth, $newHeight);

                // Resize
                imagecopyresized($tmp, $src_to_resize, 0, 0, 0, 0, $newWidth, $newHeight, $startWidth, $startHeight);

                // Output
                imagejpeg($tmp,$src_to_resize,70);

                JFile::upload($src_to_resize, $dest);

                // echo's to see what's going on
                $msg  = 'n$startWidth = '.$startWidth;
                $msg .= 'n$startHeight = '.$startHeight;
                $msg .= 'n$newWidth = '.$newWidth;
                $msg .= 'n$newHeight = '.$newHeight;

                $msg .= 'n$src inside added code = '.$src;
                $msg .= 'n$src_to_resize = '.$src_to_resize;
                $msg .= 'n$tmp inside added code = '.$tmp;
                $msg .= 'n$dest inside added code = '.$dest;
                }

                // from this point it's the original code
                // it was originally not between this else-statement

                else {
                   JFile::upload($src, $dest);
                }

                $db->setQuery("INSERT INTO #__rscomments_comments SET `file` = '".$db->getEscaped($filename.'.'.$ext)."'");
                $db->query();
                $IdComment = $db->insertid();

                $session->set('com_rscomments.IdComment', $IdComment);
                $valid = true;

            } else { $msg = JText::sprintf('RSC_ERROR_SIZE',$set_size); $valid = false; }
        } else { $msg = JText::sprintf('RSC_ERROR_EXTENSION',implode(', ',$extensions)); $valid = false; }
    }

    echo '<form name="frameform" id="frameform" action="'.JRoute::_('index.php?option=com_rscomments&task=uploadfile').'" method="post" enctype="multipart/form-data">';
    echo '<input type="file" name="file" />'.$successfully_uploaded;
    echo '<input type="hidden" name="root" id="root" value="" />';
    echo '<input type="hidden" name="url_captcha" id="url_captcha" value="" />';
    echo '</form>';

    if ($valid) {
        echo "<script type="text/javascript">
            alert('".$msg."');
            window.parent.rsc_save('".$root."','".$url_captcha."');
        </script>";
    } else {
        if($msg != ''){
        echo "
        <script type="text/javascript">
            alert('".$msg."');

            // reload captcha
            sign = ('".$url_captcha."'.indexOf('?') == -1) ? '?' : '&';
            if(window.parent.document.getElementById('submit_captcha_image')) window.parent.document.getElementById('submit_captcha_image').src = '".$url_captcha."'+sign+'sid=' + Math.random();

            // reload recaptcha
            if(window.parent.document.getElementById('rsc_recaptcha'))
            {
                window.parent.document.getElementById('recaptcha_response_field').value = '';
                window.parent.Recaptcha.reload();
            }
        </script>";
        }
    }
    exit();
}

$startWidth = 600
    $startHeight = 183
    $newWidth = 500
    $newHeight = 152
    $src inside added code = /tmp/phpi108VE
    $src_to_resize inside added code = Resource id #126
    $tmp inside added code = Resource id #127
    $dest inside added code = serverpath/test600px55.jpg