public boolean isValid(String urlString)
	{
		URL url = null;
		try
		{
			url = new URL(urlString);
		}
		catch (MalformedURLException e)
		{
			return false;
		}
		URLConnection conn;
		try
		{
			conn = url.openConnection();
			conn.connect();
		}
		catch (IOException e)
		{
			return false;
		}
		return true;
	}