Three teenagers went on trial Wednesday for allegedly spray-painting Nazi swastikas around a Vienna park, and prosecutors were considering the youths' preemptive offer to perform 60 hours of community service. The trio of 15-year-olds were arrested last summer after painting the symbols, the Nazi greeting "Sieg heil!" and slogans disparaging of Turks and other foreigners in the downtown park. Their trial was suspended Wednesday after they entered guilty pleas and offered to work without pay at a neighborhood youth center. Invoking Nazi symbols and spreading Nazi propaganda is a crime in Austria, which Hitler annexed before World War II.