You are probably only seeing it only in IE because your Internet Options are set to display a notification about every script error IE encounters, whilst your other browsers simply ignore such errors.
Our cart scripting does not throw any errors by itself, so any errors you are seeing would be caused by a conflict between our cart javascript and some other javascript you are using in your page. You may need to simply rearrange the order of various script references in your page, which often remedies such javascript conflicts.
If you wish, you can split off this portion of our View Cart code, independently of the View Cart button link itself, and move it anywhere you wish, such as up into the HEAD section or down just before the </BODY> tag:
<script language="javascript" type="text/javascript">
<!--
function EJEJC_lc(th) { return false; }
// -->
</script>
<script src='http://www.e-junkie.com/ecom/box.js' type='text/javascript'></script>