For example:
<script><!-- document.write( (new Date())); --></script>will display the current date and time.
<script> <!-- document.write((new Date() - new Date("January 9, 1990"))/1000/3600/24/365.25); --></script>will display your age. and
<script><!-- window.open("http://www.eatonhills4h.org"); --></script>will create a pop-up window to the eatonhills 4-H website.