// JavaScript Document cambio de imagen en boton
boton = new Array(1)
  boton[0] = new Image;
  boton[0].src = 't92.png';
  boton[1] = new Image;
  boton[1].src = 'n2.png';
  boton[2] = new Image;
  boton[2].src = 'sc2.png';
  boton[3] = new Image;
  boton[3].src = 's2.png';
  boton[4] = new Image;
  boton[4].src = '';