In an early sign of promise, Israeli and Palestinian leaders pledged Thursday in a cordial first round of talks to keep meeting at regular intervals, aiming to nail down a framework for overcoming deep disputes and achieving lasting peace within a year.As their facilitator-in-chief, Secretary of State Hillary Rodham Clinton urged Israeli Prime Minister Benjamin Netanyahu and Palestinian President Mahmoud Abbas to rise above the suspicion and skepticism that has blocked peace efforts for decades. "By being here today, you each have taken an important step toward freeing your peoples from the shackles of a history we cannot change," she said.