사이트내 검색을 수정해보고싶습니다... 채택완료

<legend>사이트 내 전체검색</legend>

<form name="fsearchbox" method="get" action="<?php echo G5_BBS_URL ?>/search.php" onsubmit="return fsearchbox_submit(this);">

<input type="hidden" name="sfl" value="wr_subject||wr_content">

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

<div class="hd_sch_total">

<select class="hd_sch_total_select">

<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>

</select>

</div>

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

<input type="text" name="stx" id="sch_stx" maxlength="20">

<input type="submit" id="sch_submit" value="검색">

</form>

이렇게 기본 소스가 있는데요??

여기에서 추가하고싶은게

기간별로 1개월 , 3개월 이런식으로 넣고싶은데

어떻게 하면 가능할지... 팁좀 주세요 그누형님ㅠㅠ