var doc;
function ShowHideDoc(id) {
    var body = getItem('dlbody' + id);
    if (!body) {return;}
    if (body.style.display == 'none') {
        var title = getItem('dltitle' + id);
        var prevbody = getItem('dlbody' + doc);
        var prevtitle = getItem('dltitle' + doc);
        if (prevbody) {
            prevbody.style.display = 'none';
            prevtitle.style.display = '';
        }
        body.style.display = '';
        title.style.display = 'none';
        doc = id;
    }
}