function tabSwitch( active, number, tab_prefix, content_prefix ) {

    for( var i=1; i < number + 1; i++ ) {
        document.getElementById(content_prefix+i).style.display = 'none';
        document.getElementById(tab_prefix+i).className = '';
    }
    
    document.getElementById(content_prefix+active).style.display = 'block';
    document.getElementById(tab_prefix+active).className = 'active';
}