function wopen(url, name, w, h)
	{
  	// Allow for window decoration space, sidebars...
  	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=yes, 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();
	}