Stir together 3/4 cup brown sugar, sugar, flour, baking soda and salt.
Mix in eggs and crushed pineapple until well combined.
Spread batter into greased 15x10x1 inch jellyroll pan.
Mix 1/2 cup brown sugar with 1/2 cup nuts.
Sprinkle over batter.
Bake in preheated 350 degree oven for 20 minutes or until cake is golden brown.
Heat sweetened condensed milk and butter until boiling.
Cook for 3 minutes.
Remove from heat and add nuts.
Pour milk mixture over cake.
Cool completely before cutting.