':''; echo ($sort_key=='mail_id' and $sort_order=='1')?'\'遞減\'':''; echo "" ?> 序號 ':''; echo ($sort_key=='newdate' and $sort_order=='1')?'\'遞減\'':''; echo "" ?> 日期   ':''; echo ($sort_key=='subject' and $sort_order=='1')?'\'遞減\'':''; echo "" ?> 主旨   ':''; echo ($sort_key=='doit' and $sort_order=='1')?'\'遞減\'':''; echo "" ?> 是否寄送   ':''; echo ($sort_key=='maildate' and $sort_order=='1')?'\'遞減\'':''; echo "" ?> 寄送時間