It's been rough sledding lately for many mutual funds. August outflows from U.S.-focused stock mutual funds will be around $9 billion, according to a TrimTabs Investment Research forecast. That follows a July in which the average U.S. stock mutual fund lost 3% in total returns. And the big names aren't immune, either. The storied Legg Mason Value Trust Fund (LMVTX) -- whose top 10 holdings include Google (NASDAQ:GOOG), Amazon (NASDAQ:AMZN), and Qwest (NASDAQ:Q) -- has lost more than $900 million in the first part of the year. And Legg Mason (NYSE:LM) investors pulled roughly $7 billion from its funds between April and June 2007. So is it time for you to sell your fund? In this installment of Fool Video, I ask Motley Fool Mutual Fund expert Shannon Zimmerman.