function hideButtons(){
  for(i=0; i<form_001.length; i++){
    field = form_001.elements[i];
    var type = field.type;
    if ((type == "button") || (type == "submit") || (type == "reset")){
      field.style.visibility = 'hidden';
    } 
  }
  return true;
}

function showButtons(){
  for(i=0; i<form_001.length; i++){
    field = form_001.elements[i];
    var type = field.type;
    if ((type == "button") || (type == "submit") || (type == "reset")){
      field.style.visibility = 'visible';
    } 
  }
  return true;
}

function printPage(n){
  if(exitsForm()){
    hideButtons();
  }
  if((n!=null) && (n > 1)){
    alert("Recuerde que debe imprimir "+n+" veces este documento\n\nPara ello actualice el número de copias a "+n+" en la ventana de impresión.");
  }
  window.print();
  if(exitsForm()){
    showButtons();
  }
  return true;
}

function exitsForm(){
  if(document.forms[0])
    return true;
  else
    return false; 
}