FIRST LAYER:
Prepare lime Jello according to box instructions. Add 1 envelope Knox gelatin. Place in 13 x 9 container. Let set in refrigerator.
SECOND LAYER:
Cream cheese; add condensed milk and peaches; mix. Prepare lemon Jello according to box instruction. Add 2 envelops Knox. Add to cream cheese mixture. Place over first layer. Let set.
THIRD LAYER:
Prepare strawberry Jello according to box instructions. Add 1 envelope Knox. Place over second layer. Let set.