Thanks for your reply....but I'm not quite sure how to put 
the filter option to wipe duplicate files. Can you show me 
an example?
For problem No. 2, you may check it at 
<http://www.dvdrhelp.com/tools> , under "bitrate 
calculators", you will find "vcdhelp bitrate calc" which 
will direct you to <http://www.dvdrhelp.com/calc.htm> . I'm 
not quite used to javascript, but in this calc.htm, you'll 
find a built-in calculator which can calculate the bitrate 
after filling some information needed. If this site has 
something to do with javascipt, how can I then retrieve 
this page from my hard drive...???