请大家帮我看看我的复选框判断~没头绪了~谢谢了
我这是图书馆查询页面，里面有复选框和单选按钮，查询提交时无论单选或多选至少选一个，就是如果不选单选就要有一个复选，如果复选不选就要有一个单选~代码如下：

<%@LANGUAGE= "VBSCRIPT "   CODEPAGE= "936 "%>

<meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 ">
<title> 书籍查询 </title>

<link   href= "css/yangshi.css "   rel= "stylesheet "   type= "text/css ">
<style   type= "text/css ">
<!--
.style8   {color:   #FF0000}
-->
</style>
<script   language= "javascript ">

function   checkvalue(theform)
{  
     
      for(j=0;j <theform.checkbox.length;j++)
      if(theform.checkbox(i).checked==true)
      {
    break;
        }
      for(i=0;i <theform.radiobutton.length;i++)
      if   (theform.radiobutton[i].checked==true)
      {
      break;
        }
if   (i==theform.radiobutton.length)
{
      alert( "您没选择任何查询项目 ");
      return   false;
}
return   (true);
}
</script>
<!--#include   file= "top.asp "-->

<table   width= "75% "     border= "0 "   align= "center ">
    <tr>
        <td   height= "27 "   class= "style4 "> <div   align= "center "> 书目查询 </div> </td>
    </tr>
</table>
<table   width= "75% "     border= "0 "   align= "center ">
    <tr>
        <td> <span   class= "style1 "> </span> 在这里，您可以对 </span> <span   class= "style8 "> 本馆图书 </span> 进行分类及详细查询 </td>
    </tr>
</table>
<form   name= "form1 "   method= "post "   action= "ac_booksearch.asp "   >
    <table   width= "68% "   height= "232 "     border= "0 "   align= "center ">
        <tr>
            <td   colspan= "2 "   > <span   class= "style6 "> 1.请选择查询路径 </span> </td>
        </tr>
        <tr   >
            <td   width= "15% "> </td>
            <td   width= "85% "   > <input   name= "radiobutton "   type= "radio "   value= "1 ">                
            <span   class= "style7 "> 编号 </span>
                <span   class= "style7 "> <input   name= "booknum "   type= "text "   id= "booknum ">
  &n