How to remove text when the mouse rollout

1

How do I remove text when the mouse rollout? I can’t find the right code to use and unloadMovie is not the right method.

var myLV:LoadVars = new LoadVars();

btn1.onRollOver = function(){
_level0.myLV.load(“vars/email0.txt”);
};

btn1.onRollOut = function() {
_level0.myLV.unloadMovie();
}