Selina Hodge is tired of being on kidney dialysis for nine hours a day and still feeling sick, so she is taking a long shot: She is begging for a kidney donor -- on Craigslist. The practice is legal, has been done for years and succeeds on occasion. The Palm Beach Gardens woman, 28, said she fears that just being on the waiting list at the University of Miami transplant center won't save her. "The doctor told me since I'm young and have been on dialysis for awhile, it's a priority that I get a kidney. Scary thing I found out is that being on dialysis can cause heart problems. Please help me!" Hodge said in her Craigslist note. Hodge is trying to tap the throngs who visit Craigslist to see the 50 million classified ads posted every month, most of which are peddling items and services.