function wopen(url, name, w, h) {
	  // Fudge factors for window decoration space.
	  // In my tests these work well on all platforms & browsers.
	  w += 32;
	  h += 96;
	  wleft = (screen.width - w) / 2;
	  wtop = (screen.height - h) / 2;
	  // IE5 and other old browsers might allow a window that is
	  // partially offscreen or wider than the screen. Fix that.
	  // (Newer browsers fix this for us, but let's be thorough.)
	  if (wleft < 0) {
	    w = screen.width;
	    wleft = 0;
	  }
	  if (wtop < 0) {
	    h = screen.height;
	    wtop = 0;
	  }
	  var win = window.open(url,
	    name,
	    'width=' + w + ', height=' + h + ', ' +
	    'left=' + wleft + ', top=' + wtop + ', ' +
	    'location=no, menubar=no, ' +
	    'status=no, toolbar=no, scrollbars=no, resizable=no');
	  // Just in case width and height are ignored
	  win.resizeTo(w, h);
	  // Just in case left and top are ignored
	  win.moveTo(wleft, wtop);
	  win.focus();
}