  This paper has been removed by arXiv administrators because it overlaps
gr-qc/0303009, hep-th/0405047, gr-qc/0412120, and others.
  This paper also has excessive overlap with the following papers also written
by the authors or their collaborators: gr-qc/0607119, gr-qc/0607103,
gr-qc/0607115, and others.
