title: Listener for moving away from input box
body: <p>I have two HTML <code>input</code> boxes, and I want to make them so that whenever the user finishes typing in the first box (and moves away from it -- say, by hitting "Tab" or clicking the mouse outside the area), the number is copied over into the second box. What JavaScript/JQuery mouse listener should I use, and how can I use it?</p>