how do I convert one big mp3 file into seperate files

[cmf21]

i need a program that will take a large mp3 and split it into seperate files so I can change songs when listening. Any suggestions. I would prefer not to have to do it manually.

 

[datalink7]

Nero burning software will do it, if you have it.

 

[cmf21]

Hate to ask, but how do you do that in nero.