asp.net 4.0で、JavaScritからpostする方法

＜script type="text/javascript"＞
function rowSelected(sender, args) {
var key = args.getDataKeyValue("ChildPN");
var theForm = document.forms['form1'];
theForm.method = "post";
theForm.action = "BOMSubmit.aspx?pt=" + key;
theForm.submit();
}
＜/script＞