그누기본형 검색바
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<!-- 검색 시작 -->
<table width="<?=$table_width?>" cellspacing="0" cellpadding="0">
<tr>
    <td width="43" height="11"></td>
    <td width="220"></td>
    <td width=""></td>
    <td width="234"><img src="<?=$g4['path']?>/img/search_top.gif" width="234" height="11"></td>
    <td width="35"></td>
</tr>
<tr>
    <td height="33"><img src="<?=$g4['path']?>/img/bar_01.gif" width="43" height="33"></td>
    <td><img src="<?=$g4['path']?>/img/bar_02.gif" width="220" height="33"></td>
    <td background="<?=$g4['path']?>/img/bar_03.gif" width="472" height="33"><table width=100% cellpadding=0 cellspacing=0><tr><td width=25>&nbsp;</td><td><?//=popular();?></td></tr></table></td>
    <td>
        <table width="100%" height="33" cellspacing="0" cellpadding="0">
        <form name="fsearchbox" method="get" action="javascript:fsearchbox_submit(document.fsearchbox);">
        <!-- <input type="hidden" name="sfl" value="concat(wr_subject,wr_content)"> -->
        <input type="hidden" name="sfl" value="wr_subject||wr_content">
        <input type="hidden" name="sop" value="and">
        <tr>
            <td width="25" height="25"><img src="<?=$g4['path']?>/img/search_01.gif" width="25" height="25"></td>
            <td width="136" valign="middle" bgcolor="#F4F4F4"><INPUT name="stx" maxlengt=20 style="BORDER : 0px solid; width: 125px; HEIGHT: 20px; BACKGROUND-COLOR: #F4F4F4" maxlength="20"></td>
            <td width="12"><img src="<?=$g4['path']?>/img/search_02.gif" width="12" height="25"></td>
            <td width="48"><input type="image" src="<?=$g4['path']?>/img/search_button.gif" width="48" height="25" border="0"></td>
            <td width="13"><img src="<?=$g4['path']?>/img/search_03.gif" width="13" height="25"></td>
        </tr>
        <tr>
            <td width="234" height="8" colspan="5"><img src="<?=$g4['path']?>/img/search_down.gif" width="234" height="8"></td>
        </tr>
        </form>
        </table></td>
    <td></td>
</tr>
</table>

<script language="JavaScript">
function fsearchbox_submit(f)
{
    if (f.stx.value == '')
    {
        alert("검색어를 입력하세요.");
        f.stx.select();
        f.stx.focus();
        return;
    }

    /*
    // 검색에 많은 부하가 걸리는 경우 이 주석을 제거하세요.
    var cnt = 0;
    for (var i=0; i<f.stx.value.length; i++)
    {
        if (f.stx.value.charAt(i) == ' ')
            cnt++;
    }

    if (cnt > 1)
    {
        alert("빠른 검색을 위하여 검색어에 공백은 한개만 입력할 수 있습니다.");
        f.stx.select();
        f.stx.focus();
        return;
    }
    */

    f.action = "<?=$g4['bbs_path']?>/search.php";
    f.submit();
}
</script>
<!-- 검색 끝 -->
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기본형 아닌것은
http://www.sir.co.kr/bbs/board.php?bo_table=g4_skin&wr_id=1330
http://www.sir.co.kr/bbs/board.php?bo_table=g4_skin&wr_id=15124
그대로 따라하시면 됩니다..