Radio group help

Sup fellas, I have a question/problem that I would like to ask. Anyways, I have a radio group name called “gender”. I want to be able to alert a message ONLY when the second radio group is NOT select on an ‘onblur’ event. So let say i’m tabbing through my form, I get to “female” and tab away, NOTHING should happen. However, when I tab away from “male” then an alert box display.

<input type="radio" value="female" name="gender" />
<input type="radio" value="male" name="gender" />