FTSE up 0.5 pct midday

By Tricia Wright

LONDON (Reuters) - London's top share index rose at midday on Friday, on track for a fifth straight day of gains, boosted by oils, miners and banks, as investors cautiously await results from Citi (C.N).

By 12:45 p.m. the FTSE 100 .FTSE was up 20.50 points or 0.5 percent at 4,382.34, set for its biggest weekly rise since January after hitting a four-week high in the previous session.

Bank of America (BAC.N) became the next in a line of U.S. companies unveiling second-quarter earnings, in the wake of strong results from IBM (IBM.N), Intel (INTC.O), Goldman Sachs (GS.N) and JPMorgan Chase (JPM.N).

It posted a lower quarterly profit, hurt by a surge in troubled loans as more credit card and mortgage customers fell behind on payments.

"The (BoA) results look better, but that's in large part due to cost cutting as they've lost baggage, which just shows they were rather flabby before," said Philip Gillett at IG Index.

Citigroup's (C.N) earnings should provide the focus this afternoon.

Energy stocks added the most points to the FTSE 100 index, as crude prices remained above $61 a barrel.

BG Group (BG.L), BP (BP.L), Cairn Energy (CNE.L) and Royal Dutch Shell (RDSa.L) added between 0.9 and 2.2 percent.