게시판 검색에 아이피 검색을 넣고싶은데요...

관리자만 아이피 검색을 하게 하고 싶어서 

<fieldset id="bo_sch">

    <legend>게시물 검색</legend>

    <form name="fsearch" method="get">

    <input type="hidden" name="bo_table" value="<?php echo $bo_table ?>">

    <input type="hidden" name="sca" value="<?php echo $sca ?>">

    <input type="hidden" name="sop" value="and">

    <label for="sfl" class="sound_only">검색대상</label>

    <select name="sfl" id="sfl">

        <option value="wr_subject"<?php echo get_selected($sfl, 'wr_subject', true); ?>>제목</option>

        <option value="wr_content"<?php echo get_selected($sfl, 'wr_content'); ?>>내용</option>

        <option value="wr_subject||wr_content"<?php echo get_selected($sfl, 'wr_subject||wr_content'); ?>>제목+내용</option>

        <option value="mb_id,1"<?php echo get_selected($sfl, 'mb_id,1'); ?>>회원아이디</option>

        <option value="mb_id,0"<?php echo get_selected($sfl, 'mb_id,0'); ?>>회원아이디(코)</option>

        <option value="wr_name,1"<?php echo get_selected($sfl, 'wr_name,1'); ?>>글쓴이</option>

        <option value="wr_name,0"<?php echo get_selected($sfl, 'wr_name,0'); ?>>글쓴이(코)</option>

<?php if ($admin_href) { ?><option value="wr_ip"<?php echo get_selected($sfl, 'wr_ip'); ?>>IP</option><?php } ?> 

    </select>

    <label for="stx" class="sound_only">검색어<strong class="sound_only"> 필수</strong></label>

    <input type="text" name="stx" value="<?php echo stripslashes($stx) ?>" required id="stx" class="frm_input required" size="15" maxlength="15">

    <input type="submit" value="검색" class="btn_submit">

    </form>

</fieldset> 

빨간색 부분을 추가했는데 검색이 안되요...

좀 도와주시면 감사하겠습니다...