function bind_recommend(){
  $("#recommend div.table_righta_button_titlebg > div").mouseover(function(){
    if($(this).hasClass("table_righta_button_change")){
      //remove other selection
      $("div.table_righta_button_titlebg > div.table_righta_button_in").removeClass("table_righta_button_in").addClass("table_righta_button_change");
     $(this).addClass("table_righta_button_in").removeClass("table_righta_button_change");
       var pos=$("#recommend div.table_righta_button_titlebg > div").index($(this));
      $("#recommend > div.righta_table_body").hide().eq(pos).show();
      
    }
  });
}

//initialize
$(document).ready(function(){
 bind_recommend();
});