Mahmoud, How are you loading the first AudiClip and what sound format are you using? If I recall, to applet loads an audio file (Sun au format with a sample rate of 8000) using a URL and an optional file name. Would someting like this do the trick?
This assumes that you have an "audio" directory in the root where your applet resides and that your applet is aware of all the files that are there. Hope this helps Sean