This movieclip is not moving..

[fradal]

Hello,
I'm new to this forum and I'd like to thank you for all the information that I've found here!
It's really useful!

I've got a problem with the script below..
I need to move the movieclip tn1 from position 600(x) 1(y) to position 1 1.
I've tried to use the onenterframe event, but it doesn't seem to work and I cannot understand why :(

This is the script:

var tn1:MovieClip = this.createEmptyMovieClip("tn1", getNextHighestDepth());
tn1.loadMovie("1.jpg");
tn1._x = 600;
tn1._y = 1;
tn1.onEnterFrame = function() {
if(this._x == 1) {
delete this.onEnterFrame;
} else {
this._x -= 1;
}
}


Can you please help me figuring out where the error is?

Thank you


Francesco