Egypt, one of the only two Arab states to sign peace with Israel, is wobbling dangerously on the brink of revolutionary change with potentially spreading fallout. This week, Israel was dismayed to find itself looking suddenly at three latently hostile fronts about to spring up around its borders:  Lebanon, which has dropped into the Iranian orbit, followed by Egypt, which is heading for terra incognita, and the Gaza Strip, where the Palestinian Hamas, offshoot of the Egyptian Muslim Brotherhood, has gained altitude as a Middle East player from the rise of its less radical parent.