如图，后台设置好了问题分分类。可前台不显示，希望有高人指点！谢谢！

当问题分类无法显示时，点击后退，再点击前进，就出现分类了？为什么？？

代码部分：

<td>

    <script src="/ask/category.asp" language="javaScript"></script>

    <div style="clear:both;" ><font color="red">*</font> <span>请您选择正确的分类，以使您的问题得到更专业的解答。

</span></div></td>

category.asp代码：

<!--#include file="../conn.asp"-->

var subsmallclassid = new Array();

<%

set ors=Conn.Execute("select ClassID,ClassName,ParentID FROM KS_AskClass WHERE parentid<>0 order by rootid,orders")

dim n:n=0

do while not ors.eof

%>

subsmallclassid[<%=n%>] = new Array(<%=ors(2)%>,<%=ors(0)%>,'<%=trim(ors(1))%>')

<%

ors.movenext

n=n+1

loop

ors.close

set ors=nothing

%>

function changesmallclassid(selectValue)

{

document.getElementById('smallclassid').length = 0;

document.getElementById('smallclassid').options[0] = new Option('-选择-','');

for (i=0; i<subsmallclassid.length; i++)

{

if (subsmallclassid[0] == selectValue)

{

document.getElementById('smallclassid').options[document.getElementById('smallclassid').length] = new Option(subsmallclassid[i][2], subsmallclassid[i][1]);

}

}

}

function changesmallerclassid(selectValue)

{

document.getElementById('smallerclassid').length = 0;

document.getElementById('smallerclassid').options[0] = new Option('-选择-','');

for (i=0; i<subsmallclassid.length; i++)

{

if (subsmallclassid[i][0] == selectValue)

{

document.getElementById('smallerclassid').style.display='';

document.getElementById('smallerclassid').options[document.getElementById('smallerclassid').length] = new Option(subsmallclassid[i][2], subsmallclassid[i][1]);

}

}

}

<%

exec="select ClassID,ClassName from KS_AskClass where parentid=0 order by rootid"

set rs=server.createobject("adodb.recordset")

rs.open exec,conn,1,1

%>

document.write ("<select name='classid' id='classid' style='width:120px' size='8' onChange='changesmallclassid(this.value)'>");

document.write ("<option value='' selected>-选择-</option>");

<%

do while not rs.eof%>

document.write ("<option value=<%=rs(0)%>><%=rs(1)%></option>");

<%

rs.movenext

loop

rs.close

set rs=nothing

%>

document.write ("</select>")

document.write ("  <select name='smallclassid' size='8' onChange='changesmallerclassid(this.value)' style='width:120px' id='smallclassid'>");

document.write ("<option value='' selected>-选择-</option>");

document.write ("</select>")

document.write ("  <select name='smallerclassid' size='8' style='display:none;width:120px' id='smallerclassid'>");

document.write ("<option value='' selected>-选择-</option>");

document.write ("</select>")

7.0