How to add one symbol in between the user give input.

Hi,

     In my flash had the following code.

import flash.events.TextEvent;

tf.addEventListener(TextEvent.TEXT_INPUT, tfHandler);

function tfHandler(e:TextEvent):void{

    trace(e.target.text.length);

    if(e.target.text.length == 2){

        e.target.appendText("-");

        stage.focus = tf;

        tf.setSelection(tf.text.length,tf.text.length);

    }

}

     Like this How to do in AS2.?

Thanks with,

Viswa