[jQuery] Variable in :eq() with jquery.calculation

[jQuery] Variable in :eq() with jquery.calculation


Hi All,
I'm trying to use jquery.calculation to calculate some text inputs
versus a selected field. I'm running into an issue with using
variables to select information from the same row. Here's what I have
so far. Any help would be greatly appreciated:
<script type="text/javascript">
    $(document).ready(
        function (){
            $("input[name^=module-]").bind("keyup", recalc);
            $("input[name='input-positions']").bind("click", recalc);
            recalc();
        }
    );
    function recalc(){
    var i = $(this)[0].rowIndex;
        $("[id=total-positions-left]").calc("avail - (used * qty)",
            {    avail: $("[name='input-positions']:checked").val(),
                used: $("[td.item-qty-pos-reqd'].eq(i)"),
                qty: $("input[id^='module-qty'].eq(i)")
            }),
        i = ++
            $("#total-positions-left").text($this.sum()
                );
            }
    </script>