PRAGUE (Reuters) - The new Czech lower house of parliament, elected in a June 19-20 general election, met briefly for the first time on Wednesday, opening the way for a new Social Democrat minority government to take office. At the end of the session on Friday, the caretaker government of Prime Minister Josef Tošovský is due to step down. President Václav Havel is then expected to name Social Democrat leader Miloš Zeman premier-designate. The centre-left Social Democrats, who won most votes at the election, and the centre-right Civic Democratic Party (ODS) of former Prime Minister Václav Klaus, which came second, signed a controversial "opposition agreement" last week allowing the Social Democrats to form a government. The ODS agreed not to initiate or support a vote of no confidence in the new government, ensuring its survival. The Social Democrats have 74 seats in the 200-seat lower house. The tacit support of the ODS`s 63 deputies will ensure no party or grouping can muster the votes needed to drive through a vote of no confidence.