function MM_over(_obj){
  var obj = _obj;
  var imgObj = $(obj).children().children("img");
  var img_src = imgObj.attr("src");
  var over_src = img_src.replace("_off", "_over");
  imgObj.attr({
    src : over_src
  });
}

function MM_out(_obj){
  var obj = _obj;
  var imgObj = $(obj).children().children("img");
  var img_src = imgObj.attr("src");
  var over_src = img_src.replace("_over", "_off");
  imgObj.attr({
    src : over_src
  });
}

function set_MM_over_out(){
  $("#n_message").mouseover(function(){MM_over(this)});
  $("#n_message").mouseout(function(){MM_out(this)});
  $("#n_career").mouseover(function(){MM_over(this)});
  $("#n_career").mouseout(function(){MM_out(this)});
  $("#n_photo").mouseover(function(){MM_over(this)});
  $("#n_photo").mouseout(function(){MM_out(this)});
  $("#n_voice").mouseover(function(){MM_over(this)});
  $("#n_voice").mouseout(function(){MM_out(this)});
  $("#n_lesson").mouseover(function(){MM_over(this)});
  $("#n_lesson").mouseout(function(){MM_out(this)});
  $("#n_access").mouseover(function(){MM_over(this)});
  $("#n_access").mouseout(function(){MM_out(this)});
  $("#n_link").mouseover(function(){MM_over(this)});
  $("#n_link").mouseout(function(){MM_out(this)});
  $("#n_blog").mouseover(function(){MM_over(this)});
  $("#n_blog").mouseout(function(){MM_out(this)});
  $("#n_top").mouseover(function(){MM_over(this)});
  $("#n_top").mouseout(function(){MM_out(this)});
  
//top
  $("#t_photo").mouseover(function(){MM_over(this)});
  $("#t_photo").mouseout(function(){MM_out(this)});
  $("#t_photo").mouseover(function(){MM_over($("#t_enter"))});
  $("#t_photo").mouseout(function(){MM_out($("#t_enter"))});
  $("#t_enter").mouseover(function(){MM_over(this)});
  $("#t_enter").mouseout(function(){MM_out(this)});
  $("#t_enter").mouseover(function(){MM_over($("#t_photo"))});
  $("#t_enter").mouseout(function(){MM_out($("#t_photo"))});

}

$(set_MM_over_out);