window.onload = function(){
    (function(){
    var block_a;
    var block_b;
    block_a = $("#block_on_main_1").height();
    block_b = $("#block_on_main_2").height();
    align_top = block_a - block_b;
    if (align_top >= 30)
        {
            console.info('block_a >> : '+block_a);
            $("#block_on_main_2_hid_1").show();
        }else
        {
            console.info('block_a <<: '+block_a);
        }
    if (align_top >= 50)
        {
            console.info('block_a >> : '+block_a);
            $("#block_on_main_2_hid_2").show();
        }else
        {
            console.info('block_a <<: '+block_a);
        }

    var block_c;
    var block_d;
    block_c = $("#block_on_main_3").height();
    block_d = $("#block_on_main_4").height();
    align_bottom = block_c - block_d;
    if (align_bottom >= 30)
        {
            console.info('block_c >> : '+block_c);
            $("#block_on_main_4_hid_1").show();
        }else
        {
            console.info('block_c <<: '+block_a);
        }
    if (align_bottom >= 50)
        {
            console.info('block_c >> : '+block_c);
            $("#block_on_main_4_hid_2").show();
        }else
        {
            console.info('block_c <<: '+block_a);
        }
    //$("#block_on_main_1").height();

    })();
};