radioButtonlist javascript로 처리하기!

var obj = document.getElementById("<%= rdbBOM.ClientID %>");
        var input = obj.getElementsByTagName("input");
        //alert(input.item(1).checked);

        if (tdElements[18].innerText == "Y") {
            input.item(0).checked = true;
            input.item(1).checked = false;
        }
        else {
            input.item(1).checked = true;
            input.item(0).checked = false;
        }