function getURLParam(name) {
  name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
  var regexS = "[\\?&]" + name + "=([^&#]*)";
  var regex = new RegExp(regexS);
  var results = regex.exec(window.location.href);
  if (results == null)
    return "";
  else
    return results[1];
}
function getId(id) {
    return document.getElementById(id);
}
function Mostra(id) {
    var div = getId(id);
    div.style.visibility = "visible";
}
function Esconde(id) {
    var div = getId(id);
    div.style.visibility = "hidden";
}