function prev_subj($id){
$DROOT=getenv('DOCUMENT_ROOT');
include("sql.php3");
$db=mysql_connect($sql['host'], $sql['user'] , $sql['passwd']);
$qstr="select id,aid from bbs_subj where id='$id'";
$rs=mysql_db_query($sql['db'],$qstr);
$row=mysql_fetch_array($rs);
$aid=$row['aid'];
$qstr="select id from bbs_subj where aid='$aid' order by wdate DESC";
$rs=mysql_db_query($sql['db'],$qstr);
$pid=$id;
while($row=mysql_fetch_array($rs)){
$tid=$row['id'];
if($id==$tid) break;
$pid=$tid;
}
return $pid;
}
//

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