function addToBagFromCollection(refAr){

                                addToBag(refAr, 1);

                }

               

                function addToBag(refAr, units){                          

                                var refStr = "";

                                var Nref = refAr.length;

                                for(var i = 0; i < Nref; i++){

                                                if(refStr != "") refStr = refStr + "_";

                                                refStr = refStr + refAr[i];

                                }
                                $("#carrito_form #carrito_prod_ref").val(refStr);

                                $("#carrito_form #carrito_prod_N").val(units);

                                $("#carrito_form #carrito_acc").val("add_prod");

                                var form_action = $("#carrito_form #carrito_form_action_base").val() + "product";

                                $("#carrito_form").attr("action", form_action);

                                $("#carrito_form").submit();

                }