The argument is the URL of the sound to be played.
This method also sets this type of area to be non-terminal.
Thread soundLoader;
StringTokenizer st = new StringTokenizer(arg, ", ");
delay = Integer.parseInt(st.nextToken());
try {
sound = new URL(parent.getDocumentBase(), st.nextToken());
} catch (MalformedURLException e) {
sound = null;
}