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>