Hi Ning,
Well, once we removed a file, it is gone, but there are a couple of things you can try.
1- Re-installing the code.
2- If you have another CSS, you can copy the script by doing ¨show script commit_redundancy¨, copy the output in a notepad, then erase the ¨txt¨ extension. Then you can copy the file into the CSS script folder, here you can FTP into the CSS, and doing a PUT into the script directory, remember that you need to do ¨bin¨ before doing the PUT.
If you decide to go with option 2 and you are having problems, I will recommend to open a service request, since this is a procedure that TAC know and can help further.
Hope this help.
Rod.