protected URL getAudioURL()
	{				
		String urlString = getAudioFileName();
		URL url = null;
		if (urlString!=null)
		{
			try
			{
				url = new URL(getDocumentBase(), urlString);				
			}
			catch (Exception ex)
			{
				System.err.println(ex);	
			}
		}		
		return url;
	}