The trouble appears to be caused by a conflict between the versions of jQuery included in our cart vs. that used in your site. I'm guessing you found the EJEJC_PLAYNICE parameter in this forum thread:
http://www.e-junkie.com/bb/topic/4067
They key thing there is that when our cart detects a jQuery version conflict, or when you explicitly use "EJEJC_PLAYNICE=true;", your cart customization code must reference "ejejc_jQuery" rather than "jQuery" -- e.g., the script portion of our View Cart code in your site should look like this:
<script language="javascript" type="text/javascript">
<!--
function EJEJC_lc(th) { return false; }
function EJEJC_config() {
EJEJC_PLAYNICE=true;
EJEJC_INITCSS = false;
EJEJC_OPACITY = 70;
EJEJC_WIDTH = 920;
EJEJC_HEIGHT = 550;
EJEJC_POSTCALL = true;
}
function EJEJC_shown() {
ejejc_jQuery("#btnContShop").remove();
ejejc_jQuery("#country1").attr("innerHTML", "Your Country");
ejejc_jQuery("#tdPmnt").attr("innerHTML",
"<a href='https://www.e-junkie.com/ecom/gb.php?c=cart\&i=YYYYYY\&cl=XXXXXX\&ejc=2'
target=ej_ejc class=ec_ejc_thkbx onClick='javascript:return EJEJC_lc(this);'>
Add our bonus widget to your order for only $5.00!</a>");
}
// -->
</script>
<script src='http://www.e-junkie.com/ecom/box.js' type='text/javascript'></script>
BTW, you may notice I also omitted "EJEJC_CPOP=true;" there. That parameter would open PayPal checkouts in a popup window, but we recommend against using that anymore because modern browsers with popup blockers tend to suppress that window, preventing the buyer from reaching checkout. We only document it anymore for historical purposes, in case anyone who'd been using it in their site wonders what it was for.