Get return value from js action in normal krpano action

Hey all
I have normal krpano action and i'm wanna calling js testing action and get return value from that action.
transitionTime = testing(get(currentSceneBeforeClickLoadScene), get(prevImage), get(image));
trace(get(transitionTime));

It show null all time

Thanks. I'm currently using krpano.set to update krpano variable in action javasciprt. So i'm using get func in normal action to get value of it. Do u think its ok?

thank you ^^