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

function mopen(id) {
    mcancelclosetime();

    if (ddmenuitem) ddmenuitem.style.visibility = 'hidden';

    ddmenuitem = document.getElementById(id);
    ddmenuitem.style.visibility = 'visible';

}
function mclose() {
    if (ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

function mclosetime() {
    closetimer = window.setTimeout(mclose, timeout);
}

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

document.onclick = mclose;