Ska is not dead. It's just in a vegetative state, can't breathe without a ventilator and hasn't had solid food in years. Less Than Jake is doing its part to keep the pulse beating, albeit faintly. The Florida-bred ska punks have gradually become more punk than ska as the pop-punk wave crested at its mainstream peak. But while the skunk bands of the '90s continue to drown one by one, LTJ manages to stay afloat with a rising generation of youngsters. Anthem, the band's latest effort, has won new fans and detractors alike, but based merely on its ability to survive, perhaps LTJ can find an unofficial anthem of its own from the Gibb boys -- a little song called "Staying Alive."