Little help with addChild

Hello everybody!
I am trying to make a rain effect (kind of), and i don't know how to set the drops quantity based on a variable.
This is the code i did so far:

Code:

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addEventListener(Event.ENTER_FRAME, onEnterFrame);
function onEnterFrame(event): void {
        drop[i] = new drop();
        addChild(drop[i]);
        //Random position of drop
        drop[i].y = Math.random() * stage.stageHeight;
        drop[i].x = Math.random() * stage.stageWidth;
}

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Maybe the problem here is the enterframe, infact ofcourse it creates more drops if i raise the frames per second of the swf.
I would like to stay 30 frames per second, but i also would like to choose how many drops are created.

Another big problem is that i want to remove the drop after a while with a command inside the MC itself, and putting inside that drop MC the line:

Code:

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this.parent.removeChild(this);

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it does not work :(

Any hint for both things please?
Thanks a lot!

Quote:

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putting inside that drop MC the line

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this totally works, I did it myself before.

Quote:

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drop[i] = new drop();

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this makes no sense.

Quote:

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I would like to stay 30 frames per second, but i also would like to choose how many drops are created.

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add "for (var i:int = 0; i < 5; i++) { ... }" around your code

Quote:

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Originally Posted by realMakc

this totally works, I did it myself before.

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ypeError: Error #1009: Cannot access a property or method of a null object reference. at DROP/frame10()

maybe you do it twice, e g because your mc timeline loops. put a stop() there, or do if (this.parent != null) check