织梦怎么实现下拉搜索指定栏目功能？

<form action="{dede:field name='phpurl'/}/search.php" name="formsearch">   
 <div class="form">   
 <input type="hidden" name="kwtype" value="0" />   
 <input name="keyword" type="text" class="search-keyword" id="search-keyword" />   
 <select name="typeid" class="search-option" id="typeid">      
 <option value='0' selected='1' class="search-xl">全部栏目</option>     
 {dede:channelartlist typeid='top' }   {dede:type} <option value='[field:id/]'>[field:typename/]</option>{/dede:type}     
 {dede:channel type='son' noself='yes'}   <option value='[field:id/]'>-[field:typename/]</option>   {/dede:channel}{/dede:channelartlist}</select>   
 <button type="submit" class="search-submit">站内搜索</button>   
 </div>   
 </form>  

<form action="{dede:global.cfg_cmsurl/}/plus/search.php" method="get" id="globalsearchform">  
    <div class="globalsearchform">  
        <input name="q" type="text" class="input" id="globalsearchform_key" name="key" value="输入关键词搜索产品..." onfocus="if(this.value=='输入关键词搜索产品...'){this.value='';}"  onblur="if(this.value==''){this.value='输入关键词搜索产品...';}">  
    </div>  
    <div class="globalsearchformselect">  
        <select name="typeid" class="search-option" id="typeid">  
        {dede:channelartlist typeid='9,10'}{dede:type}   
        <option value='[field:id/]'>[field:typename/]</option>{/dede:type}   
            {dede:channel type='son' noself='yes'}<option value='[field:id/]'>-[field:typename/]</option>{/dede:channel}   
        {/dede:channelartlist}   
        </select>  
    </div>  
    <div class="globalsearchform1">  
        <input type="image" class="imgbutton" src="{dede:global.cfg_templets_skin/}/images/searchr.png" id="button" name="imageField">  
    </div>  
</form>