A Blue Panorama Boeing 737-400, registration 9H-GTC performing flight BV-2221 from Tirana (Albania) to Milan Malpensa (Italy) with 143 people on board, was enroute at FL340 about 20nm south of Ancona (Italy) when a windshield cracked also causing the loss of cabin pressure. The crew initiated an emergency descent to FL100 and diverted to Ancona for a safe landing about 25 minutes after leaving FL340.