The key to the diary is in the bottom of the aquarium.
Get the screwdriver from the kitchen drawer and take the battery out of the toy truck. Put it in the remote control and turn on the TV. Climb up onto the antenna (aerials) and you will pick up a static charge. Jump left onto the green balloon and you will stick to it as it drifts left to the highest picture frame. Jump to the shelf above it, and spill some fish food off the shelf into the aquarium (this distracts the fish). Then turn off the filter (aerator) on the right side of the aquarium, and you can dive down to the treasure chest where the key is.
The steps:
open the diary the you can find over the computer.
you put it in cj's diary in her room
the key is inside the one to the diary
go to CJ's room and put it in her diary above her computer
In the fish tank in Cj's living room in her apartment.
Have fun
You get the diary key and the torn page. Use the diary key on the diary and combine the torn page. Then jump on the lamp as low as it can go and turn it on. Put the paper under it.
how
go to teliscope
You put the torn page with it.
well, you have to jump hard to get to the balloon, and it takes you over to the fish tank where you find the key to cj's diary.
the clues are in her diary witch is on her shelf above her computer