If radio button checked, then submit to different page
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I have this:

    <form method="post" id="kl" action="step2.php">
    
    <input type="radio" name="rubrik" value="bussines"></input>
    <input type="radio" name"rubrik" value="private"></input>
    
    <input type="image" value="submit" src="/images/submit.png" alt="Submit" />
    
    </form>

What i bassicaly want is: When the second radio button is checked, to submit the form to step2a.php, a different file. How can i do this? Jquery, Javascript, php?