ผมจะใช้ postDataReturnText ส่งข้อมูลไปหา php ได้ยังไงครับ

	function add_comment(topic,user,msg) {
			var comment_add = "/process/comment-add.php";
			var pt = 'topic=' + topic + '&user=' + user + '&msg=' + msg;
			//alert(pt);
			document.getElementById("comment_add_" + topic).value="";
			document.getElementById("comment_add_" + topic).focus();
			postDataReturnText(comment_add,pt);
	}