I have an array (for checkboxes) that I need to pass alongside the regular form in an ajax post, but can't seem to get this to work:

new_data = [a,b,c,d,e];

somedata_assoc = JQuery.param({'choices[]': new_data});

    $.ajax({
        type: "POST",
     url: contract_qurl,
     data: $(div).find("form").serialize()+"&"+somedata_assoc,
     context: $(this),
     success: function(data) { $("#results_table").html(data); }
    });