[MrPoma]

создаете мувиклип. в его свойствах в поле Class пишете MyIndex. в нем создаете текстовое поле txt.

MyIndex:

class MyIndex extends MovieClip{
    private var color_over:Number;
    private var color:Number;
    private var text_format:TextFormat;

    function MyIndex(){
          color = 0;
          color_over = 0x640000;

          text_format = new TextFormat();
          text_format.color = color;
    }

    function onRollOver():Void{
           text_format.color = color_over;
	this.txt.setNewTextFormat(text_format);
    }

    function onRollOut():Void{
           text_format.color = color;
	this.txt.setNewTextFormat(text_format);
    }
}