Markets withstand bombings.(flux in stock indexes )

Byline: Todd Mason

Jul. 8--U.S. stock indexes posted small gains after an initial sell-off yesterday as investors shrugged off the bombings in London.

"We have learned some very valuable lessons in the post-9/11 era," said Joel Naroff, chief economist at Commerce Bancorp Inc. "Just because terrorism exists doesn't mean the economy is going to collapse."

The Dow Jones industrial average gained 31.61, or 0.31 percent, to 10,302.29, having fallen 95 points earlier in the day. The Nasdaq composite index rose 7.01, or 0.34 percent, to 2,075.66, while the Standard & Poor's 500 index was up 2.93, or 0.25 percent, at 1,197.87.

European markets …