var active_annex="";
function changeContent(div1, div2) {
    document.getElementById(div1).innerHTML = document.getElementById(div2).innerHTML;
    document.getElementById('annex_'+ div2).className='active';
    if (active_annex != "" && active_annex != div2) {
        document.getElementById('annex_'+ active_annex).className='';
    }
    active_annex=div2;
}