#Python - <strike>114</strike> 113 characters
    from sys import *
    s=""
    for f in argv[1]:
     if ord(f) in range(65,91):
         s+=")"
    else:
      s+=("("+f)
    print s

Abuses python's indentation parser to use one space for a full tab, five for two tabs.
**Edit 1** - saved an unneeded space in the range() function