如图 部门主页是一个channel,点击后，进入下一个页面， 如何在下一个页面中，得到部门主页的id号？ 谢谢

[@cms_content_page count='10' orderBy='4' channelId=channel.id channelOption='1' dateFormat='yyyy-MM-dd']
        [#list tag_pagination.list as a]
        <div class="hdNews hasPic">
            
            [#if a.typeImg??]
            <a href="${a.url}" target="_blank" class="pic" style="border:1px solid #ccc;">
            <img src="${a.typeImg!site.typeImg}" />
            </a>
            [/#if]
            <a href="${a.url}" title="${a.title}" target="_blank">
            <h2>[@text_cut s=a.title len=22 /]</h2>
            </a>
            <p>
            [@text_cut s=a.desc len=60 append='...'/]
            <span style="color:#999">(${a.date?string(dateFormat)})</span>
            </p>
        
        </div>
        [/#list]
        <div style="clear:both;"></div>
        <div class="pagesite">[@cms_pagination sysPage='1'/]</div>
        [/@cms_content_page]
        

 channelId=channel.id