script to add a comma and space after a number

I need a program (script?) that will allow me to paste telephone numbers using any format (eg. 9998887777 or 999-888-7777) to then generate an output of adding a comma and a space before the next number. For example: Here are some telephone numbers my employee will copy from excel to paste in your program: 708-777-5182 561-574-4208 852-335-7502 514-701-5573 813-262-6262 in the next field your program would generate the output of: 708-777-5182, 561-574-4208, 852-335-7502, 514-701-5573, 813-262-6262 Important things are when I copy from the field that has the comma and space, it is in that format meaning it cannot be in the format of xxx, xxx, xxx, but rather xxx, xxx, xxx because we are pasting this into google voice's format. Another important thing is that when the script generates the desired format there is a "copy button" for us to easily add it to the clipboard. I would like a mockup version of this. It's important that it's very easy to use and has a nice interface. If you are good, there may be more work for you. I have plans to have scrapers made to pull data from websites. Please let me know if you are capable of doing this as well but note it's not required for this project. Thanks! ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform This should work on all pc's (windows 7, vista, and xp) Will this be able to work on a apple computer?