WROCLAW, Poland/FRANKFURT (Reuters) – Treasury Secretary Timothy Geithner will discuss with European finance ministers the possibility of leveraging the euro zone's bailout fund to make it more effective in fighting the debt crisis. The disclosure came as the European Central Bank, the Fed and other major central banks announced joint action to ease dollar funding for stricken European banks to tackle an emerging credit crunch due to the sovereign debt crisis. Geithner will hold talks with EU ministers in Poland on Friday and will propose that the EFSF, the 440 billion euro fund set up in May 2010, be used in a similar way to an emergency fund created by the U.S. Treasury and Federal Reserve in 2008 to handle the subprime crisis, sources said. "Geithner will probably insist on the importance...