Combine graham cracker crumbs, 1/2 cup sugar and margarine. Cover bottom of 13 X 9 cake pan with the graham cracker mixture. Bake at 375 for 8 minutes and let cool. Combine cream cheese and 1/2 cup sugar. Blend in whipped topping. Layer over crust. Chill throroughly. Prepare topping and layer over cream cheese mixture. TOPPING: Dissolve gelatin in boiling water then add cold water. Fold in orange sherbert. Add pineapple and mandarin oranges. Layer over cream cheese mixture. Chill thoroughly.
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