The Bombay Stock Exchange benchmark Sensex on Monday jumped by 236 points, in opening trade on fresh buying in heavyweight stocks by foreign funds. The 30-share index rose by 236.28 points to 17,776.57 points.The BSE barometer had lost over 160 points in the past two sessions. The wide-based National Stock Exchange index Nifty rose by 42.45 points, to 5,287.20 points.Metal, PSUs, technology and power stocks were in the limelight, giving a push to the Sensex.Brokers said firming trend on the Asian markets and hopes of better earnings by corporates for the December quarter, mainly triggered wide-spread buying by foreign funds as well as retail investors.