var timeout = 500;
var closetimer = 0;
var ddmenuitem = 0;
var ddmenurootitem = 0;

function jsdropdownmenu_open() {
    jsdropdownmenu_canceltimer();
    jsdropdownmenu_close();
    ddmenuitem = $(this).find('ul').css('visibility', 'visible');
    ddmenurootitem = $(this).css('margin-top', '0px');
}

function jsdropdownmenu_close() {
    if (ddmenuitem) ddmenuitem.css('visibility', 'hidden');
    if (ddmenurootitem) ddmenurootitem.css('margin-top', '0px');
}

function jsdropdownmenu_timer() {
    closetimer = window.setTimeout(jsdropdownmenu_close, timeout);
    if ($(this).find('ul').size() == 0)
        $(this).css('margin-top', '0px');    
}

function jsdropdownmenu_canceltimer() {
    if (closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
    } 
}

$(document).ready(function() {
    $('#jsdropdownmenu > li').bind('mouseover', jsdropdownmenu_open)
    $('#jsdropdownmenu > li').bind('mouseout', jsdropdownmenu_timer)
});

document.onclick = jsdropdownmenu_close;