Take Character And Combine Them.

I was wondering if there was any easy way to do the following in javascript:

I have two form fields, firstname and last name, as the user enters their information into a form I want to be able to show them what their username is going to be.

While they enter the information into the fields I was hoping to have it generate the username as the type.

I need to take the first letter of their first name (the first letter in the firstname field) and the entire lastname to combine it into a username. Except if there are spaces or any other characters such as dashes apostrophes they must be removed.