Ok, so I had a friend do this and it seems to work. He wasn't happy that there wasn't documentation (or at least I couldn't find any) and the solution requires Jquery. If you'd like to HIRE him, visit his site http://mattmower.com/ DO NOT contact him with questions or asking for help.
XXXXXX = your client id
YYYYYY = product 1
ZZZZZZ = product 2
Copy/paste to add more products:
<input class="product_choice" type="checkbox" name="i" value="ZZZZZZZ" /><label for="checkbox4">Product 2</label>
CODE BEGINS>>>>>
<script type="text/javascript">
var product_urls = [];
function tt_url_for_product_with_code( code ) {
return "https://www.e-junkie.com/ecom/gb.php?c=cart&i="+code+"&cl=XXXXXXXXXXX&ejc=2";
}
jQuery(document).ready( function() {
jQuery('input.product_choice').click( function() {
product_urls = [];
jQuery('input.product_choice').each( function( idx, elem ) {
if( jQuery(elem).is(":checked" ) ) {
product_urls.push( tt_url_for_product_with_code( jQuery(elem).attr( "value" ) ) );
}
});
if( product_urls.length < 1 ) {
jQuery("a.open_cart").attr( "href", "#" ).attr( "target", null );
} else {
jQuery("a.open_cart").attr( "href", "javascript:EJEJC_multiAdd(product_urls)" ).attr( "target", "ej_ejc" );
}
});
});
</script>
<form id="product_selection">
<input class="product_choice" type="checkbox" name="i" value="YYYYYYYY" /><label for="checkbox2">Product 1</label>
<input class="product_choice" type="checkbox" name="i" value="ZZZZZZZ" /><label for="checkbox4">Product 2</label>
<a class="open_cart" href="#"><img src="http://www.e-junkie.com/ej/ejadd_to_cart.gif" alt="Add to Cart" border="0" /></a>
</form>