function getRadioValue(obj) {
    for (var i = 0; i < obj.length; i++) 
    	if (obj[i].checked) return obj[i].value;
    return false;
}

function checkRadioValue(obj, val) {
    for (var i=0; i<obj.length; i++) {
    	if (obj[i].value == val) obj[i].checked = true;
    	else obj[i].checked = false;
    }
}