NEW YORK, Oct 5 (Reuters) - U.S. stocks rose at the open onFriday with the S&P 500 set to hit its highest since 2007, asthe September payrolls report showed a surprise drop in thejobless rate and gave legs to this week's rally.

The Dow Jones industrial average gained 56.93 points,or 0.42 percent, to 13,632.29. The Standard & Poor's 500 Index