Central European currencies have reached levels close to all-time records against the euro in recent days, boosted by strong economic performance and a rush by international investors to the region.
On Thursday morning, the Polish zloty was trading at just under 3.80 to the euro, its strongest rate since 2002.
By Friday, the zloty had eased off slightly and stood at around 3.81 to the euro.
The Czech koruna closed Friday at 28.90 to the euro, near its record.
Slovak markets were closed Friday because of a Roman Catholic religious holiday, but the koruna ended the day's trading on Thursday at 37.65, also near its record.
Analysts attribute the rise in the currencies to central Europe's strong economies and to investors ditching the dollar after the U.S. Federal Reserve hinted at the beginning of the year that transatlantic interest rates were as high as they were going to go for a while.
Experts have predicted GDP growth of 4.3 percent, inflation at 1.5 percent and a 3.2-percent budget deficit in Poland in 2006.
The Warsaw stock exchange climbed to new highs in the first week of 2006, with blue chips showing gains of 5.6 percent.
Polish interest rates are higher than in eurozone countries, and investors are fighting to get their hands on Polish bonds.