Digital Workshop

Hi,
I want to make an HTML5 sound player where i can change the sound files without every time changing the program.
What i want to do it by giving the mp3 files a name e.g. 001.mp3, 002.mp3 etc.
After 2 weeks the audio files must change and i was wondering if it's possible to just replace the mp3 files with different ones but with the same names. In that case i only have to upload them with a FTP program in the same folder.
I tried to do that but when i play the files i still hear the originals. How can i do this?

Kind Regards,
Ad Mulders

UPDATE
Changing the mp3 files works!
I did clear the cache and then it works great.