var showDateShort = 1;
var showDate = 2;
var showDateTime = 3;
var showTime = 4;

function ShowDateTime( dateStyle )
{
  var today = new Date();
  var dStr = "";

  switch( dateStyle )
  {
    case showDateShort:
      dStr = today.toDateString();
      break;
    case showDateTime:
      dStr = today.toLocaleString();
      break;
    case showTime:
      dStr = today.toLocaleTimeString();
      break;
    case showDate:
    default:
      dStr = today.toLocaleDateString();
      break;
  }
  document.write(dStr);
}