in addition to what LastRoseStudios said, don't put the script in your head, put i right before your closing body tag like:
Code:
<script src="./js/ModalEmail.js" type="text/javascript"></script>
<script type="text/javascript">
$('#info').ModalEmail({
stylesheet : "./css/baseStyle.css",
action : "./content/contactus/mailer.php",
simple : false
});
</script>
</body>
</html>
You are calling the script to find "#info" before the #info div is being loaded by the page. So Call your script in the HTML after your #info div in the code.