请问如何调用相簿缩图?

<?php
require_once('./include/main.inc.php');
require_once('./include/common.inc.php');

$itemid=$_REQUEST['itemid'];
if($itemid)
{
        $sql='SELECT subject,filepath FROM '.tname('attachments').' where itemid='.$itemid.' order by aid desc';
        $query = $_SGLOBAL['db']->query($sql);
        while($item = $_SGLOBAL['db']->fetch_array($query)) {
                echo 'document.write(\'<div class="imagebox"> <a href="'. A_DIR.'/'.$item['filepath'].'" target=album> <img border=0 vspace=5 hspace=5 width=150 src="'. A_DIR.'/'.$item['filepath'].'"> <P>'.$item[subject].'<P></div>\');';

        }
}
?>

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红色那段字现在是原图.想改成缩图.应该如何改?

此段是e23大大发表的Flash相册换成传统图片浏览方式.我想做些修改
https://discuz.dismall.com/thread-706700-1-1.html