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;