I don't believe VBScript has a Format function... But you could do it this way:

VB Code:
  1. SSN = "999999999"

  2. fSSN = mid(SSN, 1, 3) & "-" & mid(SSN, 4, 2) & "-" & mid(SSN, 7, 4)

  3.  
  4. response.write(fSSN)