[greenyoda]

If you're an employee and you wrote the script while on the job, your employer already owns it, so you can't sell it to them. (If your script is currently running on your employer's computer, that also supports the case for it being their property.)

A better strategy might be to tell them about how you increased the productivity for this task by writing this script, and use that as evidence that you should receive a raise.

[AwesomeFaic]

I'd bet they already technically own the second script in progress. OP should read up on what to take into consideration when working on side projects, especially when they pertain to ones day job.