Frogs Logic

Somewhere out of the city, 2 groups of colored frogs get stuck in a swamp. How fast can you solve the problem for them?
The rules:
The green frogs group wants to cross to the left side of the swamp & The blue frogs group wants to cross to the right side. Notice that: Each frog can move forward only. A frog can advance by one step, if the space in front of it is free. A frog can jump over a frog from the other group only.