window.onload = function() {
    var listItems = document.getElementsByTagName('li');
    for (var i = 0; i < listItems.length; i++) {
        if (listItems[i].id.charAt(0) == 'y')
            $addHandlers(listItems[i], { 'click': function(e) {
                var anchor = this.getElementsByTagName('a')[0];
                var listItems = document.getElementsByTagName('li');
                for (var i = 0; i < listItems.length; i++) {
                    if (listItems[i].id.substr(0, 5) == 'm' + this.id.substr(1, 4)) {
                        if (Sys.UI.DomElement.containsCssClass(anchor, 'year'))
                            listItems[i].style.display = 'block';
                        else
                            listItems[i].style.display = 'none';
                    }
                }
                Sys.UI.DomElement.toggleCssClass(anchor, 'year');
                Sys.UI.DomElement.toggleCssClass(anchor, 'year_expanded');
            }
            }, listItems[i]);
    }
}