Help with a game

I want to do an advergame. Its quite simple but i dont know which rules do i need to create.

The game works this way.

Theres 2 characters: 1 male and 1 female

The character starts at the bottom of the platform and the product starts to fall from the top (there are about 5 products)

1 type of enemy: a razor which will appear on the left and will go to right of screen.

If the razor hits the character, his hair will go smaller (its a hair product).

And each level, the character's hair, will go bigger (there will be 5 levels).

My question is: how to make the products to drop at a random rate and how to make the hair change its size when got hit by an enemy or level change?

thx in adv (if didnt understood i can make an image to make things clear)

a random rate:

+ Every random(3001) + 1000 milliseconds

-> drop

(drop at a random rate between 1 to 4 seconds)

to change the size of the hair create several frames of the hair from short to long, and set the animation frame according to the collisions.

where is this action drop ?

There's no such action. It was an indicator that your actions to drop something would have to be inserted there. The point was to show a way to create a random rate by using "every x milliseconds" in combination with the expression random() <img src="smileys/smiley2.gif" border="0" align="middle" />

i did understood how to make the random drop but i didnt managed to make them drop at those random rates (+1 milliseconds each sprite)

here are the rules

<img src="http://img830.imageshack.us/img830/2011/rulescap.jpg" border="0" />

I added the bullet behavior to the each sprite (the ones that will have to drop)