function popWin(what, win_name, win_width, win_height, dir_yn, loc_yn, menu_yn, scrl_yn, tool_yn, resize_yn, stat_yn) {
	if (document.all)
		var xMax = screen.width, yMax = screen.height;
	else
		if (document.layers)
			var xMax = window.outerWidth, yMax = window.outerHeight;
		else
			var xMax = 1024, yMax=768;

	var xOffset = (xMax - win_width)/2, yOffset = (yMax - win_height)/2;

	var URL = what;
	var windowName = win_name;
	var features =
	 'width='        + win_width +
	 ',height='      + win_height +
	 ',directories=' + (dir_yn) +
	 ',location='    + (loc_yn) +
	 ',menubar='     + (menu_yn) +
	 ',scrollbars='  + (scrl_yn) +
	 ',status='      + (stat_yn) +
	 ',toolbar='     + (tool_yn) +
	 ',resizable='   + (resize_yn) +
	 ',screenX='     + xOffset +
	 ',screenY='     + yOffset +
	 ',top='         + yOffset +
	 ',left='        + xOffset;
	window.open (URL, windowName, features);
}