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;