Dissolve 1 (6 ounce) package sugar free strawberry Jello in two cups boiling water. Cool with one quart cold water. Add one package sugar free lemonade, one 12 ounce can frozen orange juice, one 6 ounce can frozen pineapple juice, 7 cups cold water. Mix in large container and freeze. Take out one hour before serving. Add one liter diet 7-Up.