function update_progress_bar(obj_id, current_number, total_number, showtext) {
    
    document.getElementById(obj_id + '_image').style.width =(parseInt((current_number / total_number) * 100) - parseInt((1 / total_number) * 100)) + '%';
    if (showtext == true) {
        document.getElementById(obj_id + '_text').innerHTML = 'Question ' + current_number + ' of ' + total_number; 
    }
    else {
        document.getElementById(obj_id + '_text').innerHTML = '';
    }
}

function pbar_set_percentage(obj_id, percentage) {

    document.getElementById(obj_id + '_image').style.width = percentage + '%';
    
}

function pbar_set_text(obj_id, str_text) {

    document.getElementById(obj_id + '_text').style.width = str_text;
    
}