نحوه تغییر نوع فونت یوزر در پست بیت به فونتِ دلخواه ؟

کد php:
{$ignore_bit}
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder" style="{$post_extra_style} {$post_visibility}" id="post_{$post['pid']}">
    <tr>
        <td class="{$altbg}" width="15%" valign="top" style="white-space: nowrap; text-align: center;"><a name="pid{$post['pid']}" id="pid{$post['pid']}"></a>
        <a href="member.php?action=profile&uid={$post['uid']}" id="kullanıcı_{$post['pid']}"><span class=largetext><strong>{$post['userpop']}</span></strong></a>
<script type="text/javascript">
                         document.write('<div id="kullanıcı_{$post['pid']}_popup" class="popup_menu" style="display: none;"><div class="popup_item_container"><a href="private.php?action=send&amp;uid={$post['uid']}" class="popup_item"><b> ارسال پیام خصوصے به کاربر</b><\/a><\/div><div class="popup_item_container"><a href="member.php?action=emailuser&amp;uid={$post['uid']}" class="popup_item"><b>ارسال یک ایمیل به کاربر</b><\/a><\/div><div class="popup_item_container"><a href="member.php?action=profile&amp;uid={$post['uid']}" class="popup_item"><b>مشاهدۀ پروفایل کاربر</b><\/a><\/div><div class="popup_item_container"><a href="search.php?action=finduser&amp;uid={$post['uid']}" class="popup_item"><b>دیدن تمام ارسالهاے کاربر</b><\/a><\/div><\/div>');
new PopupMenu("kullanıcı_{$post['pid']}");
</script>{$post['onlinestatus']}<br />
        <span class="smalltext">
                        {$post['usertitle']}<br />
                        {$post['userstars']}<br />
            {$post['groupimage']}
            {$post['useravatar']}<br />
            {$post['user_details']}
        </span>
    </td>
    <td class="{$altbg}" valign="top">
        <table width="100%">
            <tr><td>{$post['posturl']}<span class="smalltext"><strong>{$post['icon']}{$post['subject']} {$post['subject_extra']}</strong></span>
            <br />
            <div id="pid_{$post['pid']}" style="padding: 5px 0 5px 0; font-size: 11px;">
                {$post['message']}
            </div>
            {$post['attachments']}
            {$post['signature']}
            <div style="text-align: right; vertical-align: bottom;" id="post_meta_{$post['pid']}">
                <div id="edited_by_{$post['pid']}">{$post['editedmsg']}</div>
                {$post['iplogged']}
            </div>
        </td></tr>
    </table>
</td>
</tr>
<tr>
    <td class="{$altbg}" style="white-space: nowrap; text-align: center; vertical-align: middle;"><span class="smalltext">{$post['postdate']} {$post['posttime']}</span></td>
    <td class="{$altbg}" style="vertical-align: middle;">
        <table width="100%" border="0" cellpadding="0" cellspacing="0">
            <tr valign="bottom">
                <td align="right" ><span class="smalltext">{$post['button_email']}{$post['button_pm']}{$post['button_www']}{$post['button_find']}{$post['button_rep']}</span></td>
                <td align="left">{$post['button_edit']}{$post['button_quickdelete']}{$post['button_quote']}{$post['thanks']}{$post['button_multiquote']}{$post['button_report']}{$post['button_warn']}{$post['button_reply_pm']}{$post['button_replyall_pm']}{$post['button_forward_pm']}{$post['button_delete_pm']}</td>
            </tr>
        </table>
    </td>
</tr>{$post['postrep_inline']}{$post['thxdsp_inline']}
</table>{$post['postrep_outline']}{$post['thxdsp_outline']}