function muestraOculta(id)
  {
	  var x = document.getElementById('div'+id).style.display
	  var y= ""
	  if (x=='block'){
		x='none'
		y='Ver '
	  }else{
		x = 'block'
		y = 'Ocultar '
	  }
	  document.getElementById('boton'+id).value = y + " solución"
	  document.getElementById('div'+id).style.display = x
  }