Lookup关联列表连接筛选后子列表自动设置选择的父项

<script type="text/javascript" src="/_layouts/TCT_KMS/jquery-1.4.1.min.js"></script>   
<script type="text/javascript">
        window.onload = function () {
            var o = parent.parent.parent.parent;
if (o) {
                var selImg = $(o.document).find("img[src='/_layouts/images/rbsel.gif']").first();
                var titleLink = selImg.parent().nextAll(".ms-vb-title:first").find("a:first");
                $("#txtOpener").val(titleLink.attr("href"));
                var fullUrl = titleLink.attr("href");

                var itemID = getQry('ID', fullUrl);
                var lookupField = $("select[name$='Lookup']");
                lookupField.val(itemID);
            }
        }
        function getQry(key,fullUrl) {
            var arr = fullUrl.split("&");
            for (var i = 0; i < arr.length; i++) {
                var ar = arr[i].split("=");
                if (ar[0] == key) {
                    return ar[1];
                }
            }
        }
</script>