/*window.onload=dropdownmenu;
function dropdownmenu(id) {
	if(id==undefined) {
		
	} else {
		for(var i=1;;i++) {
			var d = document.getElementById('submenu'+i);
			if(d) {d.style.display='none';}
			else {break;}
		}
		d = document.getElementById(id);
		if (d) {d.style.display='block';}
	}
}
function dropdownmenuhide(id) {
	var d = document.getElementById(id);
	if (d) {d.style.display='none';}
}
*/

var timeout	= 1000;
var closetimer	= undefined;
var ddmenuitem	= undefined;

// open hidden layer
function mopen(id) {	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.display = 'none';

	// get new layer and show it
	document.getElementById('submenu_container').style.display = 'block';
	ddmenuitem = document.getElementById('sub'+id);
	ddmenuitem.style.display = 'block';
}
// close showed layer
function mclose() {
	if(ddmenuitem) ddmenuitem.style.display = 'none';
	document.getElementById('submenu_container').style.display = 'none';
}

function mreset() {
	for(var i=1;;i++) {
		var d = document.getElementById('sub'+i);
		if(d) {d.style.display='none';}
		else {break;}
	}
}

// go close timer
function mclosetime() {
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime() {
	if(closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose;
window.onload = mreset;