jQuery to concatenate two fields on front end

/* for Help Scout #24709 */
<script type="text/javascript">
    var $jq = jQuery.noConflict();
    /* which fields do we want to watch for input changes? i.e. first and last name */
    $jq('#input_390_1_3, #input_390_1_6').bind('keypress blur', function() {
        $jq('#input_390_2').val($jq('#input_390_1_3').val() + ' ' + $jq('#input_390_1_6').val() );
    });
</script>