Margarita Pie

1 1/4 cups finely crushed pretzels
1/2 cup butter or margarine, melted
1/4 cup white sugar
2 limes
1/4 cup orange juice
1 (14 ounce) can sweetened condensed milk
1 (8 ounce) container nondairy whipped topping
                   
1. Combine crushed pretzels, melted butter or margarine,
   and sugar. Press mixture into a pie pan. 
2. Zest and juice both limes. 
3. Mix together lime juice and zest, orange juice, and
   condensed milk. Fold in whipped topping. Spoon filling
   into pretzel crust. 
4. Chill pie for 25 to 30 mins.