Is Earth the only planet to have water?

For long, it was believed that intelligent life existed on Earth because it was the only planet to have water. But recently, an astronomer Traviz Barman at Lowell Observatory, Arizona stated that in the atmosphere of a Jupiter-like large, gaseous planet, water vapors was found. The planet in question has been named HD 209458b and it lies about 150 light years away from Earth in a constellation called Pegasus. Earlier, their have been reports of traces of water being found on Mars by the Global Surveyor spacecraft.