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NEW YORK ( TheStreet) -- We are not the world, so stop investing like it, Jim Cramer commanded his "Mad Money" TV show viewers Wednesday. Cramer said Europe's woes are likely to cause a weak open for our stock markets Thursday, but investors need to be smart and use that weakness to buy, buy, buy. There's been a shift in our markets, said Cramer, and smart investors are no longer using weakness in Europe as a reason to sell, they're using it as a reason to buy. That makes sense because problems with banks in Cyprus or elections in Italy have absolutely nothing to so with sales at retailers such as Ross Stores ( ROST), Bed Bath & Beyond ( BBBY) or Costco ( COST), nor the U.S. housing or oil booms. Cramer said if the markets open higher tomorrow, he'd be a seller and buy back in at lower levels. If the markets open flat, he'd look for specific opportunities and buy cautiously. But if the markets open lower, which they likely will, Cramer said there are a few stocks he'd be very interested in. First off, Cramer said he'd be a buyer of the Pinnacle Foods' IPO because a lower open would likely give that food stock a 4% yield. Cramer said he'd also be a buyer of Costco and General Mills ( GIS), two great companies with strong earnings. Finally, Cramer said he likes mortgage insurer Radian Group ( RDN). So if things get ugly tomorrow, Cramer concluded, it's time to get buying.