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;