아래는 zip.skin.php에서 form 인데요..
아래 form 문에는 따로 action이 있지도 않고
아래 form 문이 어떻게 submit 되는지가 궁금 합니다.

답변 부탁 드립니다.

-----------------zip.skin.php------------------------

<table width="600" border="0" cellspacing="0" cellpadding="0">
<form name="fzip" method="get" autocomplete="off">
<input type=hidden name=frm_name  value='<?=$frm_name?>'>
<input type=hidden name=frm_zip1  value='<?=$frm_zip1?>'>
<input type=hidden name=frm_zip2  value='<?=$frm_zip2?>'>
<input type=hidden name=frm_addr1 value='<?=$frm_addr1?>'>
<input type=hidden name=frm_addr2 value='<?=$frm_addr2?>'>
<tr>
    <td colspan="2">
        <table width="100%" height="50" border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td align="center" valign="middle" bgcolor="#EBEBEB">
                <table width="98%" height="40" border="0" cellspacing="0" cellpadding="0">
                <tr>
                    <td width="5%" align="center" bgcolor="#FFFFFF" ><img src="<?=$g4[bbs_img_path]?>/icon_01.gif" width="5" height="5"></td>
                    <td width="35%" align="left" bgcolor="#FFFFFF" ><font color="#666666"><b><?=$g4[title]?></b></font></td>
                    <td width="60%" bgcolor="#FFFFFF" ></td>
                </tr>
                </table></td>
        </tr>
        </table></td>
</tr>
<tr>
    <td height="70" colspan="2" valign="bottom"><img src="<?=$g4[bbs_img_path]?>/zip_img_01.gif" width="273" height="40"></td>
</tr>
<tr>
    <td height="20" colspan="2"></td>
</tr>
<tr>
    <td width=130><img src="<?=$g4[bbs_img_path]?>/zip_img_02.gif" width="125" height="14"></td>
    <td><input type=text name=addr1 value='<?=$addr1?>' required minlength=2 itemname='동(읍/면/리)' size=35> <input type=image src='<?=$g4[bbs_img_path]?>/btn_post_search.gif' border=0 align=absmiddle></td>
</tr>
<tr>
    <td height="20" colspan="2"></td>
</tr>
</table>
<!-- 검색결과 여기서부터 -->

<script language='javascript'>
document.fzip.addr1.focus();
</script>