add_shortcode("pdf", "test_process_shortcode");

function test_process_shortcode($atts){
	$a = shortcode_atts(array('id'=>'-1'), $atts);
	// No ID value
	if(strcmp($a['id'], '-1') == 0){
		return "";
	}
	$pdf=$a['id'];
	$url=plugin_dir_url(__FILE__)."output/".$pdf."/index.html";
	$iframe = "<iframe allowfullscreen class='idrws_pdf_short' src='".$url."' style='width:80%; height:800px;'></iframe>";

	return $iframe;
}