Hi What is the difference between the format coded as frame-based and object-based? Thanks Yu Renjie ______________________________________ =================================================================== ÐÂÀËÃâ·Ñµç×ÓÓÊÏä (http://mail.sina.com.cn) ÐÂÀË·ÖÀàÐÅÏ¢£º¶þÊÖÊг¡×ßÒ»×ߣ¬¸Ã³öÊÖʱ¾Í³öÊÖ£¡ (http://classad.sina.com.cn/2shou/)