Stock futures mixed; JPMorgan earnings eyed

(Reuters) - Stock index futures pointed to a mixed open on Wall Street on Friday, with futures for the S&P 500 down 0.05 percent, Dow Jones futures down 0.1 percent and Nasdaq 100 futures up 0.16 percent at 1039 GMT. European shares were up 0.5 percent on Friday morning, extending the week's gains, led by euro zone banking stocks in the wake of successful bond sales by Spain and Italy. ...