Tween in AS doen't read string

programming flash
1

Hi all

The problem:
When you push a button, a mc (clip1) starts moving via AS
That works fine if you type clip1 directly “into the tween”
But when you do it like this, it fails. But when you trace it, you get “clip1”:
[INDENT]

import mx.transitions.Tween;
import mx.transitions.easing.*;

button.onRelease = function(){
   variable = "clip"+1;
   trace(variable);
   var myTween:Tween = new Tween(variable, "_x", Strong.easeOut, 100, 500,1, true);
}

[/INDENT]here’s the fla:
http://jellebullaert.be/school/vraag.rar

thanks in advance
Jelle