Persians helped the Spartans in the Peloponnesian War?

Question

I thought Persians conqured all cities in Greece but Sparta.
How can the Persians help the Spartans if they were enemies.

Answer 1

Actually, the Persians did ally with Sparta:

Following the destruction of the Sicilian Expedition, Lacedaemon encouraged the revolt of Athens's tributary allies, and indeed, much of Ionia rose in revolt against Athens. The Syracusans sent their fleet to the Peloponnesians, and the Persians decided to support the Spartans with money and ships. Revolt and faction threatened in Athens itself.

Whole story here:
http://en.wikipedia.org/wiki/Peloponnesian_War

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Cheers,
Bruce

Answer 2

Persian Wars have been fought among the Persian Empire and the Greek City-States. The Peloponnesian War used to be fought among the Peloponnesian League (led via Sparta) and the Delian League (led via Athens).