The media sector is buzzing after BSkyB rejected a 700p per share offer from Rupert Murdoch's News Corporation but said it would consider at least 800p per share. Shares in the satellite broadcaster are up 18%.NewsCorp, which already owns 39.1% of BSkyB, said it made an initial offer at 675p on 10 June but after a meeting with BSkyB's independent directors, raised its offer to 700p.At that price buying the outstanding shares would cost it £7.8bn but BSkyB said this offer undervalued the group "significantly."BP is dragging on the oil sector again as the company awaits a grilling from a US government panel on the ongoing oil spill in the Gulf of Mexico.Top performing sectors so far todayMedia 3,738.62 +4.26%Alternative Energy 5,938.52 +3.12%Industrial Transportation 2,264.52 +2.03%Industrial Metals & Mining 5,477.28 +1.91%Electronic & Electrical Equipment 1,940.20 +1.87%Bottom performing sectors so far todayForestry & Paper 4,405.49 -1.42%Oil & Gas Producers 6,698.04 -0.59%Household Goods & Home Construction 6,092.21 -0.48%Tobacco 25,923.54 -0.30%Beverages 8,681.25 -0.19%