JERUSALEM — After declaring victory in Israel's elections, acting Prime Minister Ehud Olmert's Kadima Party said today it would quickly form a broad ruling coalition that will carry out its plan to pull out of much of the West Bank and draw Israel's borders by 2010.

Party officials said that despite a weaker-than-expected performance in Tuesday's election, Kadima has widespread support in parliament.

Kadima won only 28 seats in the election, less than the 35 it had hoped for, but still making it the largest party in the 120-member parliament. Like every other ruling party in Israeli history, it will have to form a coalition government with other parties.

Haim Ramon, a senior Kadima lawmaker, told Israel Radio that the party is confident it will get broad backing for its withdrawal plan in parliament. "I believe we will have more than 70 legislators who will support the disengagement plan," Ramon told Israel Radio, referring to the expected West Bank pullout.

Declaring victory early today, Olmert renewed his call for peace talks with the Palestinians and said he is prepared to make painful compromises, such as uprooting some Jewish settlements in the West Bank.

"In the coming period, we will move to set the final borders of the state of Israel, a Jewish state with a Jewish majority," Olmert said. "We will try to achieve this in an agreement with the Palestinians."

But he said Israel will act on its own if it cannot reach peace with the Palestinians. This scenario appears increasingly likely following Hamas' victory in recent Palestinian legislative elections. The militant group's new government, which rejects peace talks, was set to be sworn into office late today.

With 99.7 percent of the votes counted Wednesday, the center-left Labor captured 20 seats and the hawkish Likud, which had dominated Israeli politics for decades, plummeted to 11 seats, making it only the fifth-largest party in the new parliament.

Final results are expected Friday, officials said. But for the first time, Israel will not be led by Labor or Likud. The results showed voters turning away from conventional parties to an assortment of third parties.