How to make a N-S Magnet Javascrip?

Hello, im new to scripting as many otheres. Ive been trying to come up with a script that will allow me to just have an object with one half a "north" feild and the other with a "south" field. If the script then applyed to a secound objet, both will react like regular magnets. N/n or S/s will push them away from them selfs and if N/S then just pull together. Its for a puzzel game that ive been working on. Thank you for spending the time on reading my question and any help in anyway is greatly welcomed.