// Though "Dialog" looks like an object, it isn't really an object.  Instead
// it's just namespace for protecting global symbols.

  function Dialog(url, action, init) {
	if (typeof init == "undefined") {
	  init = window;	// pass this window object by default
	}
	if (document.all) {	// here we hope that Mozilla will never support document.all
	  var value = showModalDialog(url, init, "resizable: no; help: no; status: no; scroll: no");
	  if (action) {
		action(value);
	  }
	} else {
	  return Dialog._geckoOpenModal(url, action, init);
	}
  }

  Dialog._parentEvent = function(ev) {
	if (Dialog._modal && !Dialog._modal.closed) {
	  Dialog._modal.focus();
	  // we get here in Mozilla only, anyway, so we can safely use
	  // the DOM version.
	  ev.preventDefault();
	  ev.stopPropagation();
	}
  }

  // should be a function, the return handler of the currently opened dialog.
  Dialog._return = null;

  // constant, the currently opened dialog
  Dialog._modal = null;

  // the dialog will read it's args from this variable
  Dialog._arguments = null;

  Dialog._geckoOpenModal = function(url, action, init) {
	var dlg = window.open(url, "ha_dialog",
			      "toolbar=no,menubar=no,personalbar=no,width=400,height=300," +
			      "scrollbars=no,resizable=no,dependent=yes");
	Dialog._modal = dlg;
	Dialog._arguments = init;

	// capture some window's events
	function capwin(w) {
	  w.addEventListener("click", Dialog._parentEvent, true);
	  w.addEventListener("mousedown", Dialog._parentEvent, true);
	  w.addEventListener("focus", Dialog._parentEvent, true);
	};
	// release the captured events
	function relwin(w) {
	  w.removeEventListener("focus", Dialog._parentEvent, true);
	  w.removeEventListener("mousedown", Dialog._parentEvent, true);
	  w.removeEventListener("click", Dialog._parentEvent, true);
	};
	capwin(window);
	// capture other frames
	for (var i = 0; i < window.frames.length; capwin(window.frames[i++]));
	// make up a function to be called when the Dialog ends.
	Dialog._return = function (val) {
	  if (val && action) { action(val); }
	  relwin(window);
	  // capture other frames
	  for (var i = 0; i < window.frames.length; relwin(window.frames[i++]));
	  Dialog._modal = null;
	};
  };