var Myactivateitem = 1;
$(document).ready(function() {
    $('#left_menu').hoverAccordion({
        activateitem: Myactivateitem,
        speed: 'fast', keepheight: 'false'
    });
    $('#left_menu').children('li:first').addClass('firstitem');
    $('#left_menu').children('li:last').addClass('lastitem');
});