function eventTrigger (e) {
    if (! e)
        e = event;
    return e.target || e.srcElement;
}

function radioClick (e) {
    var obj = eventTrigger (e);
	nIndex = obj.value -1;
	so_xfade()
	// ** following lines not needed for fading images.
    // var notify = document.getElementById &&
    //                document.getElementById ('notify');
    // if (notify)
    //     notify.value = 'You clicked on ' + obj.value;
    return true;
}