function movePageBar(route) {
    if(route == 'left') {
        document.getElementById('1_mid_page').innerHTML =  parseInt(document.getElementById('1_mid_page').innerHTML) - 5;
        document.getElementById('1_mid_page').style.display = 'block';
        document.getElementById('2_mid_page').innerHTML =  parseInt(document.getElementById('2_mid_page').innerHTML) - 5;
        document.getElementById('2_mid_page').style.display = 'block';
        document.getElementById('3_mid_page').innerHTML =  parseInt(document.getElementById('3_mid_page').innerHTML) - 5;
        document.getElementById('3_mid_page').style.display = 'block';
        document.getElementById('4_mid_page').innerHTML =  parseInt(document.getElementById('4_mid_page').innerHTML) - 5;
        document.getElementById('4_mid_page').style.display = 'block';
        document.getElementById('5_mid_page').innerHTML =  parseInt(document.getElementById('5_mid_page').innerHTML) - 5;
        document.getElementById('5_mid_page').style.display = 'block';
        document.getElementById('control_right').style.display = 'block';
        if(document.getElementById('1_mid_page').innerHTML ==  '2') {
            document.getElementById('control_left').style.display = 'none';
        }
    }
    if(route == 'right') {
        document.getElementById('1_mid_page').innerHTML =  parseInt(document.getElementById('1_mid_page').innerHTML) + 5;
        if (document.getElementById('1_mid_page').innerHTML == pagesNumber - 1) {
            document.getElementById('2_mid_page').style.display = 'none';
            document.getElementById('3_mid_page').style.display = 'none';
            document.getElementById('4_mid_page').style.display = 'none';
            document.getElementById('5_mid_page').style.display = 'none';
            document.getElementById('control_right').style.display = 'none';
        }
        document.getElementById('2_mid_page').innerHTML =  parseInt(document.getElementById('2_mid_page').innerHTML) + 5;
        if (document.getElementById('2_mid_page').innerHTML == pagesNumber - 1) {
            document.getElementById('3_mid_page').style.display = 'none';
            document.getElementById('4_mid_page').style.display = 'none';
            document.getElementById('5_mid_page').style.display = 'none';
            document.getElementById('control_right').style.display = 'none';
        }
        document.getElementById('3_mid_page').innerHTML =  parseInt(document.getElementById('3_mid_page').innerHTML) + 5;
        if (document.getElementById('3_mid_page').innerHTML == pagesNumber - 1) {
            document.getElementById('4_mid_page').style.display = 'none';
            document.getElementById('5_mid_page').style.display = 'none';
            document.getElementById('control_right').style.display = 'none';
        }
        document.getElementById('4_mid_page').innerHTML =  parseInt(document.getElementById('4_mid_page').innerHTML) + 5;
        if (document.getElementById('4_mid_page').innerHTML == pagesNumber - 1) {
            document.getElementById('5_mid_page').style.display = 'none';
            document.getElementById('control_right').style.display = 'none';
        }
        document.getElementById('5_mid_page').innerHTML =  parseInt(document.getElementById('5_mid_page').innerHTML) + 5;
        if (document.getElementById('5_mid_page').innerHTML == pagesNumber - 1) {
            document.getElementById('control_right').style.display = 'none';
        }
        if(document.getElementById('1_mid_page').innerHTML !=  '2') {
            document.getElementById('control_left').style.display = 'block';
        }
    }
}