dedecms会员登录前和登录后显示不同价格的办法

<script src="{dede:global.cfg_cmsurl/}/include/dedeajax2.js" type="text/javascript" ></script><script language="javascript">function CheckLogin_c(){var taget_obj = document.getElementById('_userlogin_c');   var req = document.getElementById('hid').value; myajax = new DedeAjax(taget_obj,false,fal	se,'','',''); myajax.SendGet2("{dede:global.cfg_cmspath/}/member/ajax_loginsta_c.php?val="+req); DedeXHTTP = null;}</script> 

<span id="_userlogin_c">购买链接（未登录时候显示）：{dede:field.url1/}<br />市场价格（未登录时候显示）：{dede:field.jiage1/}<br /></span><input type="hidden" value="{dede:field.aid/}" id="hid" /><script language="javascript" type="text/javascript">CheckLogin_c();</script>

<?php/** * @version        $Id: ajax_loginsta.php 1 8:38 2010年7月9日Z tianya $ * @package        DedeCMS.Member * @copyright      Copyright (c) 2007 - 2010, DesDev, Inc. * @license        http://help.dedecms.com/usersguide/license.html * @link           http://www.dedecms.com */require_once(dirname(__FILE__)."/config.php");AjaxHead();if($myurl == '') exit('');$uid  = $cfg_ml->M_LoginID;!$cfg_ml->fields['face'] && $face = ($cfg_ml->fields['sex'] == '女')? 'dfgirl' : 'dfboy';$facepic = empty($face)? $cfg_ml->fields['face'] : $GLOBALS['cfg_memberurl'].'/templets/images/'.$face.'.png';?><?php$rank=$cfg_ml->M_Rank;$row = $dsql->GetOne(" Select * From `dede_addon19` where `aid`=$val ");?>购买链接（已登录）：<?php  echo $row['url2'];?><br />本店价格：<?php  echo $row['jiage2'];?><br />