Each message is a Movie Clip Symbol - Insert > Symbol > Movie Clip

To view the Movie Clips - Window > Library

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Messages are made invisible in Frame 1

this.message1._visible = false;
this.message2._visible = false;
//this.message3._visible = false;
stop();

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When a button is rolled over the message is made visible

....on (rollOver) {this.message2._visible = true;
}
on (rollOut) {this.message1._visible = false;
}...............................