Preheat oven to 350° F. Cream sugar and margarine well. Add vanilla, flour and salt. Mix well. If the dough seems dry, add up to 2 tablespoons of the maraschino cherry juice. Stuff each cherry with a chocolate chip, then wrap in 1 teaspoon dough. Bake on ungreased cookie sheet for 12 to 15 minutes. Cool. Melt 1 cup chocolate chips in the top of a double boiler over low heat or in the microwave, and dip top of cookies in melted chocolate.