function launchViewer(relativeurl, width, height, winname) {
  if ( typeof winname == "undefined" ) winname = "Time_" + new Date().getTime();

  var viewer = window.open(relativeurl,winname,'width=' + width + ',height=' + height + ',menubar=no,resizable=yes,titlebar=no,alwaysRaised=yes,status=yes,scrollbars=1');
  viewer.focus();
}