Splitting Files

I am looking for a way to split files into parts and then have ability to combine them again into one...

Exmaple: I have 10MB file and I can run it thru function to divide the file into 10 smaller ones...
on the other hand I need to be able to combine the small files into one 10 MB

Thanks

check out "www.planet-source-code.com" and do a search on "file split" and you will find your code.