public function urlPlaceholder($iWidth, $iHeight, $iBorder = 0)
    {
        $sUrl = $this->urlPlaceholderScheme();

        //  Sub in the values
        $sUrl = str_replace('{{width}}', $iWidth, $sUrl);
        $sUrl = str_replace('{{height}}', $iHeight, $sUrl);
        $sUrl = str_replace('{{border}}', $iBorder, $sUrl);

        return $sUrl;
    }