Alert after all checkboxes have been checked
<p>i have looked everywhere(but maybe i've missed something)</p>

<p>I'm currently creating a website where people have 3 options.</p>

<p>Let's do it easy, 1,2 and 3.</p>

<p>Now the customer wants a technique that after you clicked the third checkbox(doesn't matter in which way, you can go from 1 to 3 and then 2, or 3,1 and then 2) a alert popup comes up.</p>

<p>Now i have looked everywhere but i can't find it.
Hopefully someone inhere could help me.</p>

<p>Thanx already.</p>
