<?
$sql = " select bo_table, bo_subject, bo_category_list from $g4[board_table] where gr_id = 'z1' order by bo_subject asc ";
$result = sql_query($sql);
$row2 = sql_fetch($sql);

for ($i=0; $row=sql_fetch_array($result); $i++) {
$select_subject[$i] = $row[bo_subject];
$select_category[$i] = explode("|", $row[bo_category_list]);
$count_category[$i] = count($select_category[$i]);
}

$count = count($row2);
?>

<script language="javaScript">
function changemodel(frm)
{
    if(frm.sub.options[frm.sub.selectedIndex].value == '')
{
frm.sca.options[0] = new Option("모델명","")
frm.sca.options.length=1;
}

    for (i=0; i<<?=$count?>; i++) {
else if(frm.sub.options[frm.sub.selectedIndex].value == '<?=$select_subject[i]?>')
{
    for (k=0; k<<?=$count_category[$i]?>; k++) {
frm.sca.options[k+1] = new Option('<?=$select_category?>[i][k]','<?=$select_category?>[i][k]');
}
frm.sca.options.length=$count_category[i]+1;
}
}
}
</script>

자바 스크립트좀 손좀 봐주세요 ==
도통 모르겠어요

안되는부분이

<?=$select_subject[i]?>')
k=0; k<<?=$count_category[$i]?>; k++)
new Option('<?=$select_category?>[i][k]','<?=$select_category?>[i][k]');
frm.sca.options.length=$count_category[i]+1;