How to make checked radiobutton unchecked


I have the code right here, i wonder how to make checked button unchecked when i check on one of the unchecked button?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>

<input name="radio" type="radio" id="radio" value="radio" checked="checked" />
<label for="radio">globe</label>
<input type="radio" name="radio2" id="radio2" value="radio2" />
<label for="radio2">Us</label>
 <input type="radio" name="radio3" id="radio3" value="radio3" />
 <label for="radio3">Eu</label>

Use the same name attribute name.


thanks mate,that was easy.