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;