It would be helpful if you would include what distro you are using. I found this progam which may be what you need. The libtk.so.0 is part of this program. I would delete the file you put in /usr/lib before installing this rpm.
tk-8.3.3-74.i386
If you aren't using Redhat, just do a Google search for
your distro tk-8.3.3