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;