function visualizza(id){
  if (document.getElementById){
    if(document.getElementById(id).style.display == 'none'){
      document.getElementById(id).style.display = 'block';
    }else{
      document.getElementById(id).style.display = 'none';
    }
  }
}

function numbersonly(myfield, e, dec) {
  var key;
  var keychar;
  if (window.event)
    key = window.event.keyCode;
  else if (e)
    key = e.which;
  else
    return true;
  keychar = String.fromCharCode(key);
  if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) )
    return true;
  else if ((("0123456789").indexOf(keychar) > -1))
    return true;
  // decimal point jump
  else if (dec && (keychar == ".")) {
    myfield.form.elements[dec].focus();
    return false;
  } else
    return false;
}

function mostraElmScorrevole(){
$("#elm_scomparsa").animate({"height": "toggle"}, { duration: 1000 });
}