Caramel Popcorn

6 qts. popped popcorn
1 c. brown sugar
1 c. sugar
1 c. karo syrup
1 cube butter
1 can sweetened condensed milk

Mix butter, sugars and karo together.  Cook in a saucepan on medium heat until boiling.  Stir constantly.  Add milk and boil fro 2-3 more minutes.  Stir into popcorn until all corn is coated.