get value from radio button

<% @hoge.hages do |hage| -%>
  <div lass='select_radio_hage'>
    <%= radio_button_tag "hages", hage.id, false, -%>
    <%= hage.name -%>
  </div>
<% end -%>

jQuery("#hoge_list").navGrid('#hoge_pager',{
  edit:false,add:false,del:false,search:false
}).navButtonAdd('#hoge_pager',{
  caption:"",
  title:"Export to CSV",
  buttonicon:"ui-icon-disk",
  var hage_id = jQuery("input[name=hages]:checked").val();
  onClickButton:function(){
    window.open(csv_hoges_path + hage_id + '.csv');
  }
});