function Ur()
{
  tid = new Date();
  tt = tid.getHours();
  mm = tid.getMinutes();

  if (tt<10)
  tt="0" + tt;
  if (mm<10)
  mm="0" + mm;


  document.getElementById("urfelt").innerHTML= tt + ":" + mm;
  setTimeout("Ur();",1000);
}