function treemenu(id, idBlok, img_dir, img_min, img_plus, img_open, img_close){
    if(document.getElementById(idBlok).style.display == 'block'){
        document.getElementById(idBlok).style.visibility = 'hidden';
        document.getElementById(idBlok).style.display    = 'none';
        document.getElementById(id).innerHTML = "<img src=\""+img_dir+img_plus+"\"><img src='"+img_dir+img_close+"' class=\"treemenu\">";
    }
    else{
        document.getElementById(idBlok).style.visibility = 'visible';
        document.getElementById(idBlok).style.display = 'block';
        document.getElementById(id).innerHTML = "<img src=\""+img_dir+img_min+"\"><img src='"+img_dir+img_open+"' class=\"treemenu\">";
    }
}