Not a chance.
Does Syria jump in here and open a third front.
Syria isn't suicidal to get itself directly involved unless it's in retaliation.
However, if there are long-range rocket attacks from South Lebanon tomorrow [as feared] then Israel may hit some key targets in Syria, which in turn may get a reaction and so forth.
It's an unpredictable and dangerous situation. More than likely things will simmer back down in a few days after some air strikes and ground incursions back to the relative chaos, but theres a possibility of an actual regional conflict if things get out of control.
"You can clean out the vermin in your own house, or you can have us clean out the vermin for you, or you can refuse to clean it and prevent us from doing so, in that case you will watch while we blow your house up in order to destroy the vermin, the extremist Islamic militants who started this war and who want to continue fighting it. Those are your only choices. But you better not plan on us giving up and letting your militants win, by letting them slaughter us when and where they want."
Does Syria jump in here and open a third front.
If Israel declares war on Lebanon, it is a possibility. Iran and Syria might then declare war on Israel. Then the US would probably declare war on Syria and Iran. This could get ugly fast.
Not a chance.
Syria could find itself dealing a war on a second front. Iraqi generals recently issued warnings to Syria that if they didn't do something about terrorists on their side of the border the Iraqis would.