In a medium size sauce pan, mix together, sugars, jello, water, and corn syrup. Cook on medium heat, stirring constantly until lightly boiling. Don't over cook.
Pour jello mixture over popped popcorn stirring continuously until evenly covered. Continue stirring until popcorn has cooled down and dried to keep popcorn from sticking together. Popcorn should have a sugary, crispy coating, not gooey.
I used cherry Jello for the red and berry blue Jello for the blue. Doing both colors means you need to pop twice as much popcorn and mix the coatings separately.