Hi, I was thinking about replying my own thread here after I solved that problem. Actully I used html batch editor, a software can edit a bounch of html files all at once, e.g, I was using replace function to replace 5 seconds with 8 seconds for all my html files and run this command for all html file at the same time, so it only takes 10 seconds to change all the html files. I recommond this to others who may need to put html file in medialab and have to change something for all the files in the same way. Also it has some other functions I did not explore but may be helpful to others.