$(document).ready(function(){
  $(".index_main_left_down").mouseover(function(){
    $(".index_main_left_down").css("background-color","#fffde3");
  });
  $(".index_main_right_down").mouseover(function(){
    $(".index_main_right_down").css("background-color","#fffde3");
  });
  $(".index_main_middle_down").mouseover(function(){
    $(".index_main_middle_down").css("background-color","#fffde3");
  });
  $(".index_main_left_down").mouseout(function(){
    $(".index_main_left_down").css("background-color","#e3f6fb");
  });
  $(".index_main_middle_down").mouseout(function(){
    $(".index_main_middle_down").css("background-color","#e3f6fb");
  });
  $(".index_main_right_down").mouseout(function(){
    $(".index_main_right_down").css("background-color","#e3f6fb");
  });
});