function getclickedCheck(form) {
    var f = form.elements;
    for(var i = 0; i < f.length - 1; i++) {
        if (f[i].type=="checkbox") {
            fe = f[i];
            name = fe.name;
            kongress = name.substring(5);
            tag = name.substring(3,4);
            if (kongress=='kongress') {
                if (fe.checked==true) {
                    document.getElementById("divkongresstag"+tag).style.display = 'block';
                } else {
                    document.getElementById("divkongresstag"+tag).style.display = 'none';
                    breakfast = document.getElementById("tag"+tag+"_breakfast");
                    if (breakfast) {
                        breakfast.checked = false;
                    }
                    lunch = document.getElementById("tag"+tag+"_lunch");
                    if (lunch) {
                        lunch.checked = false;
                    }
                    dinner = document.getElementById("tag"+tag+"_dinner");
                    if (dinner) {
                        dinner.checked = false;
                    }
                }
            }
        }
    }
}