At present we have no way to do that, but if you're starting a new account and haven't added products in Seller Admin yet, we can provide you with a bulk-import template file, which you'd populate with item numbers, names, prices, Remote Product File URLs (for download products), etc., then you could use your copy of that file to populate the product data on on your site. Our Add to Cart button code follows a common format like this, where XXXXXX represents the Item Number:
<a href="https://www.e-junkie.com/ecom/gb.php?c=cart&i=XXXXXX&cl=159958&ejc=2" target="ejejc" class="ec_ejc_thkbx" onClick="javascript:return EJEJC_lc(this);"><img src="http://www.e-junkie.com/ej/ejadd_to_cart.gif" border="0" alt="Add to Cart"/></a>
However, this would only work for initial setup; there'd be no easy way to have current product settings in Seller Admin synced back to your site automatically.