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;
	}
}