帝国cms列表页怎么获取父级栏目以及所有子栏目的方法

<div class="catleader minicat">
<ul class="sub-category">
<?php
$bclassid = $class_r[$GLOBALS[navclassid]][bclassid]; //获取当前父栏目ID
$cr['classid']=$class_r[$GLOBALS[navclassid]][bclassid];
$bclassurl=sys_ReturnBqClassname($cr,9);
?>
<li class="cat-item"> <a href="<?=$bclassurl?>">全部</a> </li>
[e:loop={"select classid,classname from {$dbtbpre}enewsclass where bclassid='$bclassid' order by myorder,classid asc",0,24,0}]
<?
$classurl=sys_ReturnBqClassname($bqr,9);//取得栏目地址
$on="";
if($bqr[classid]==$GLOBALS[navclassid])//当前栏目ID
{
$on="current-cat";
}
?>
<li class="cat-item <?=$on?>"> <a href="<?=$classurl?>"><?=$bqr[classname]?></a> </li>
[/e:loop]
</ul>
</div>

<?php
$bclassid = $class_r[$GLOBALS[navclassid]][bclassid]; //获取当前父栏目ID
if($bclassid!=0){
$cr['classid']=$class_r[$GLOBALS[navclassid]][bclassid];
$bclassurl=sys_ReturnBqClassname($cr,9);
}else{
//父级栏目
$bclassurl=sys_ReturnBqClassUrl($class_r[$GLOBALS[navclassid]]);
$bclassid=$GLOBALS[navclassid];
}
?>
<li ><a href="<?=$bclassurl;?>" id="nav<?=$bclassid?>">全部</a></li>
[e:loop={"select * from `[!db.pre!]enewsclass` where bclassid='$bclassid' order by myorder,classid asc ",0,24,0,0,0}]
<li><a href="<?=$bqsr[classurl]?>" id="nav<?=$bqr[classid]?>"><?=$bqr[classname]?></a></li>
[/e:loop]
<script>
$(document).ready(function(){
$("#nav[!--self.classid--]").addClass("active");
});
</script>