// taken from http://javascript-array.com/scripts/jquery_simple_drop_down_menu/#
var ddmenuitem = 0;

function jsddm_open()
{

    ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}

function jsddm_close()
{
    if (ddmenuitem) {
        ddmenuitem.css('visibility', 'hidden');
    }
}