  This paper has been removed by arXiv administrators because it plagiarizes
gr-qc/0105122.
  This paper also has excessive overlap with the following paper also written
by the authors or their collaborators: gr-qc/0502059, gr-qc/0502061,
gr-qc/0510038, gr-qc/0502032, gr-qc/0207026, gr-qc/0506062, gr-qc/0505078, and
others.
