$(document).ready(function(){
            $("#top_photo").hover(
            function(){
                $(this).attr('src','/images/top/photo_bt_h.png');
            },
            function(){
                $(this).attr('src','/images/top/photo_bt.png');
            }); 
            $("#top_takumi").hover(
            function(){
                $(this).attr('src','/images/top/takumi_bt_h.png');
            },
            function(){
                $(this).attr('src','/images/top/takumi_bt.png');
            }); 
            $("#top_diff1").hover(
            function(){
                $(this).attr('src','/images/top/diff_bt_1_h.png');
            },
            function(){
                $(this).attr('src','/images/top/diff_bt_1.png');
            }); 
            $("#top_diff2").hover(
            function(){
                $(this).attr('src','/images/top/diff_bt_3_h.png');
            },
            function(){
                $(this).attr('src','/images/top/diff_bt_3.png');
            }); 
            $("#top_history").hover(
            function(){
                $(this).attr('src','/images/top/history_bt_h.png');
            },
            function(){
                $(this).attr('src','/images/top/history_bt.png');
            });
            
            $("#top_new_aus").hover(
            function(){
                $(this).attr('src','/images/top/new_aus_h.png');
            },
            function(){
                $(this).attr('src','/images/top/new_aus.png');
            }); 
            
            $("#top_new_nz").hover(
            function(){
                $(this).attr('src','/images/top/new_nz_h.png');
            },
            function(){
                $(this).attr('src','/images/top/new_nz.png');
            }); 
            
            $('.top_content1,.top_content2').flatHeights();
        });