// definiciones basicas
OCULTO="none";
VISIBLE="block";
 
function mostrar(blo,num) {
  document.getElementById(blo+num).style.display=VISIBLE;
  document.getElementById('ver_off'+num).style.display=VISIBLE;
  document.getElementById('ver_on'+num).style.display=OCULTO;
}
 
function ocultar(blo,num) {
  document.getElementById(blo+num).style.display=OCULTO;
  document.getElementById('ver_off'+num).style.display=OCULTO;
  document.getElementById('ver_on'+num).style.display=VISIBLE;
}