dir splitter

I have directories with 30 thousand files in a single folder. I need a small program written that allows me to point to that directory/folder and sequentially place those files in new folders 001,002,003 etc with a pre determined amount of files in each (user definable) 500 1000 ETC.. Maintaining the original files Names. Example Input folder has 2900 files Want to place in folders of 500 each Output folder 001/ 500 files Output folder 002/ 500 files Output folder 003/ 500 files Etc Etc Output folder 006/400files should work on xp and win7