The problem appears to be caused by this incomplete snippet of your View Cart code:
<script language="javascript" type="text/javascript"><!--
function EJEJC_lc(th) { return false; }
// -->
</script>
The View Cart code we provide in Seller Admin includes another line which must come after the lines shown above, but which is missing in your page:
<script src="http://www.e-junkie.com/ecom/box.js" type="text/javascript"></script>
Just paste that line into your page after the first snippet shown above, and that should allow your cart buttons to work and display the cart as an overlay "inside" your page.
