Orange Chocolate Swirl Cheesecake for Christmas

“A majestic orange flavored cheesecake swirled with chocolate goodness. Orange liqueur may be substituted for the orange juice in equal amounts. These cheesecake not only looks fabulous, but the flavor will send you to cheesecake heaven”.
Ingredients
CRUST:

1 1/2 cups graham cracker crumbs
1/4 cup white sugar