function disableFS (fldName) {
    fld = eval ("document.forms[1]." + fldName + "_radio" );
    fld.checked = true;

    fldName = "c_sv" + fldName;
    fld = eval ("document.forms[1]." + fldName);
    for (i=0;i<fld.length; i++) {
        fld[i].checked = false;
    }

}

function enableFS (fldName) {
    fld = eval ("document.forms[1]." + fldName + "_radio" );
    fld.checked = false;

    fldName = "c_sv" + fldName;
    fld = eval ("document.forms[1]." + fldName);
    for (i=0;i<fld.length; i++) {
        fld[i].disabled = false;
    }

}