Javascript anyone?

I would like if someone would write me a simple javascript program that when you enter your total experience - your current exp divided by another number like 220.
It would look like this:
50800-49985(divide)220=[3.7045454545454545454545454545455 = 4] 4
If someone could write a script and send it to me at:
methelight[at]gmail[dotcom]

Thanks