How Do I Code A Radiobuttonlist Skip To Check Enable Ordisable Another Radiobuttonlist?

function GLUpos() {

    var ResultsGLU = document.getElementById('rbnGLU');
    var ResultsGLU2 = ResultsGLU.getElementsByTagName('input');

    if (ResultsGLU2[0].checked) {

        document.form1['rbnPosGLU'].item(0).disabled = false;
        document.form1['rbnPosGLU'].item(1).disabled = false;
        document.form1['rbnPosGLU'].item(2).disabled = false;
        document.form1['rbnPosGLU'].item(3).disabled = false;
        document.form1['rbnPosGLU'].item(4).disabled = false;
        document.getElementById('rbnPosGLU').disabled = false;
    }


    if (ResultsGLU2[1].checked) {

        document.form1['rbnPosGLU'].item(0).disabled = true;
        document.form1['rbnPosGLU'].item(1).disabled = true;
        document.form1['rbnPosGLU'].item(2).disabled = true;
        document.form1['rbnPosGLU'].item(3).disabled = true;
        document.form1['rbnPosGLU'].item(4).disabled = true;
        document.form1['rbnPosGLU'].item(0).checked = false;
        document.form1['rbnPosGLU'].item(1).checked = false;
        document.form1['rbnPosGLU'].item(2).checked = false;
        document.form1['rbnPosGLU'].item(3).checked = false;
        document.form1['rbnPosGLU'].item(4).checked = false;
        document.getElementById('rbnPosGLU').disabled = true;
    }

}