BEIRUT -- Syria's president gave a United Nations Middle East envoy a timetable yesterday for the full withdrawal of his military and intelligence agencies from Lebanese territory, and prodemocracy campaigners applauded the recent major pullback of Syrian troops from northern and central Lebanon.

But many activists and political leaders in Beirut said they think Syria plans to continue its domination of their country through Lebanese allies and agents. They emphasized that Syria is still far from surrendering control of Lebanon, and said they plan to hold what is expected to be a huge demonstration tomorrow to demand full sovereignty.

Amin Gemayel, who was president of Lebanon during the mid-1980s, when the Syrians were increasing their hold on the country, doubts the government can stall elections long enough for the opposition's strength to dissipate.

''The opposition is very strong now and has great momentum," said Gemayel, who has a son in the parliamentary opposition and is a senior Christian leader. ''The Hariri electoral infrastructure and network are still there. The alliances have been agreed upon."

He said he feared that Karami, pro-Syria President Emile Lahoud of Lebanon, and the regime in Damascus are ''trying games and tactics" to maintain the current powers and positions.

''Syria is still very influential here, and they have the means, in the government and the army, to manipulate Lebanese politics," Gemayel said. ''The crisis is deep. The moment is historic."

That sense of a historic turning point is pervasive among young, educated, urban Lebanese, who overwhelmingly support the opposition and who throng to the daily demonstrations in Martyrs' Square, near Hariri's grave.