Stackoverflow 2012-03-17

by john_s

HTML

<input name="accept" type="checkbox" value="0">Confirmation Box</input>

<a id="koalaLink" href="http://somelink.com">
<img src="/Koala.jpg" height="94" width="94" alt="Koala" />
</a>

JavaScript

$(function() {
    $('#koalaLink').click(function() {
        if (!$('input[name=accept]').prop('checked')) {
            alert ("You must check the box to confirm you have read and accept the Terms.");
            return false;
        } 
        return true;
    });
});