UPDATE 1-Czech rightist Topolanek appointed PM again

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PRAGUE, Nov 8 (Reuters) - Czech President Vaclav Klaus officially appointed rightist leader Mirek Topolanek as prime minister on Wednesday for the second time since an inconclusive June election left parliament deadlocked.

Topolanek faces a tough task to cobble together a government that could win a parliamentary confidence vote because both leftist and centre-right blocs in the lower house control 100 seats.

"I know that we are in a difficult situation, but even in this difficult situation we need to take a step forward," Klaus said during a brief ceremony at the ancient Prague Castle.

Topolanek, 50, was first appointed to the post in August but his rightist minority government failed to win a confidence vote and resigned in October.

"I would like to wish the old-new prime minister success in his second attempt to win the confidence of the lower house," Klaus said.

Analysts said Topolanek's two main options are forming a coalition government with the centrist Christian Democrats and the Green Party, or making a deal with only the leftist Social Democrats to support a rightist government.

The first option is more likely since Topolanek has several times ruled out a deal with the leftists on their own. They are led by his bitter rival, Jiri Paroubek.

Topolanek would be willing to include Paroubek in a four-party coalition but the former leftist prime minister has ruled out this option.

A three party centre-right government would have 100 seats in the 200-seat lower house, and thus at least one deputy from the left must cross the floor or abstain from voting to win the confidence vote. ((Reporting by Alan Crosby; prague.newsroom@reuters.com; Reuters Messaging: alan.crosby.reuters.com@reuters.net; +420 224 190 477))

Keywords: CZECH POLITICS