[devote]

Миша<input type="radio" name="fname" value="misha" checked="checked" />
Петя<input type="radio" name="fname" value="petya" />
Вася<input type="radio" name="fname" value="vasya" />
Иванов<input type="radio" name="lname" value="ivanov" checked="checked" />
Петров<input type="radio" name="lname" value="petrov" />
Сидоров<input type="radio" name="lname" value="sidorov" />
<input type="button" value="Далее" onclick="return next();"/>

<script>
  function next() {
    var fname = $('input[name=fname]:checked').val();
    var lname = $('input[name=lname]:checked').val();
    document.location = 'http://mysite.ru/' + fname + '_' + lname;
    return false;
  }
</script>