function radioChecked(thisradio) {
	for(i=0;i<thisradio.length;i++) {
		if(thisradio[i].checked)
			return thisradio[i].value;
	}
	return false;
}
function validation() {
	var info="";
	if(document.feedback.Name.value.length<3)
		info+="Please input your name.\n";
	if(document.feedback.Email.value.length<10)
		info+="Please input your Email.\n";
	if(info.length > 1) {
		alert(info);
		return false;
		}
	else  {
		return true;
	}
}