Some serious poker players put down their money in a Texas Hold'em competition last week at the Aripeka Elks Lodge, but the end result wasn't quite so serious. "It was for bragging rights," said Dominick DePetrillo, executive director of the Alzheimer's Family Organization, which for three years has staged the event to raise money for its programs and support groups. Bob Toland of New Port Richey was the "last player standing'' of more than 200 people. "When the field got down to the last six or eight players," DePetrillo said, "it got real exciting. They were betting thousands of dollars on each draw.'' Play money, of course. DePetrillo estimated the event raised about $5,000 for the organization, which offers programs in Pasco, Hernando, Citrus, Sumter, Lake and northern Pinellas and Hillsborough counties.