Hi Marc,
It doesn't look like you've included the box.js script. Add this to your header file, in the <head> area:
<script type="text/javascript" src="https://www.e-junkie.com/ecom/box.js"></script>
<script type="text/javascript">
and try putting this:
<script language="javascript" type="text/javascript">
<!--
function EJEJC_lc(th) { return false; }
// -->
</script>
...beneath the other script lines, before your cart buttons, rather than after after your cart button. Not sure if being before or after your cart buttons matter or not (I'll admit I'm not a web developer), but you definitely need to call box.js.
Makes sense to keep all the script calls in the header, below where you have the 'taber.js' and 'menu.ks' calls.
Should work then hopefully.