var winWebcam="";
  var w=340;
  var h=280;
  function openWebcam(url) {
   if (winWebcam.open) { winWebcam.close(); }
   winWebcam = window.open(url,"popup","width="+w+",height="+h+",left=5,top=20,resizable=no");
   winWebcam.focus();
   return false;
  }