Combine cookie crumbs and 1/4 cup margarine; press into bottom of 9" springform pan. Combine cream cheese and milk, mixing at medium speed on electric mixer until well blended. Add eggs, one at a time, mixing well after each addition. Blend in chocolate and vanilla; pour over crust. Bake at 300 degrees for 1 hour and 10 minutes. Loosen cake from rim of pan; cool before removing rim of pan. Beat 1/3 cup margarine and sugar until light and fluffy. Add chocolate and liqueur, mixing well. Frost top and sides of cheesecake. Chill.